The Twin Cam 103 is a strong engine from the factory, but the stock exhaust holds it back with restrictive baffles and a muted tone. Swapping to a real performance exhaust is the single most satisfying upgrade most 103 owners make, freeing up airflow, dropping weight, and giving the bike the deep rumble it was always meant to have. The trick is choosing a system that actually fits your Touring, Softail, or Dyna model and pairing it with the right tune so you gain power instead of running lean.
We pulled together seven exhaust systems that owners genuinely run on the 103, from quick bolt-on slip-on mufflers to full two into one headers. Each one below has been judged on fitment, sound character, build quality, and real dyno behavior when tuned. Whether you want a polite bark for the neighborhood or a wide-open growl for the highway, there is a system here that suits your riding.
| Photo | Product | Score | Buy |
|---|---|---|---|
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Vance & Hines Eliminator 400 Slip-On Mufflers Best Overall 4 inch billet end cap slip-on mufflers, 16 gauge steel, fits Touring 103 |
9.5 | 🛒 Check Price |
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Rinehart Racing 4 inch Slip-On Mufflers Best Sound Quality 4 inch slip-on mufflers, removable baffle, fits Harley Touring 103 |
9.3 | 🛒 Check Price |
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Bassani Xhaust Road Rage 2 into 1 System Best Full System Full 2 into 1 header and muffler, stepped design, fits Touring and Softail 103 |
9.2 | 🛒 Check Price |
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Cobra Speedster Slashdown 2 into 1 Exhaust Best Value Full 2 into 1 system, slash cut tip, fits Dyna and Softail 103 |
9.0 | 🛒 Check Price |
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Screamin' Eagle Street Cannon Slip-On Mufflers Best OEM Fit Factory engineered slip-on mufflers, fits Touring 103 with stock header |
8.8 | 🛒 Check Price |
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Python Throwback 2 into 1 Exhaust System Best Classic Look Full 2 into 1 system, retro styling, fits Softail and Dyna 103 |
8.5 | 🛒 Check Price |
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S&S Cycle Grand National 2 into 2 Slip-On Mufflers Best Race Inspired 2 into 2 slip-on mufflers, race derived baffle, fits Touring 103 |
8.3 | 🛒 Check Price |
1. Vance & Hines Eliminator 400 Slip-On Mufflers: Best Overall
The Eliminator 400 is the slip-on most 103 Touring owners reach for first, and for good reason. The 4 inch bodies look enormous on the bike, the billet end caps give it a premium finish, and the tone is exactly what people imagine a big twin should sound like. Because it reuses the factory head pipe, installation is a genuinely simple afternoon job, which makes it the easiest way to wake up a stock 103 without tearing into the front of the bike.
The honest weakness is that any slip-on can only do so much. On its own it adds attitude and a little breathing room, but the real horsepower shows up once you pair it with a high flow air cleaner and a fuel tuner to correct the leaner mixture. Treat it as the first step of a stage one package rather than a standalone power mod, and you will be thrilled. Run it bare and the gains are mostly in the soundtrack.
- Large 4 inch body with machined billet end caps for a clean, aggressive look
- Bolt-on slip-on design that uses the stock header for fast installation
- Tuned baffle delivers a deep low end without being unbearable on the highway
Pros: Loud, full bodied Harley tone that still settles down at cruising speed; Direct fit on Touring models with no header swap needed; Heavy gauge steel and quality chrome that holds up over years
Cons: Slip-on gains are modest unless you add an air kit and a tuner; Some riders find it too loud for early morning starts
2. Rinehart Racing 4 inch Slip-On Mufflers: Best Sound Quality
Rinehart built its reputation on sound, and these 4 inch slip-ons are the proof. If your top priority is a deep, layered exhaust note that turns heads without sounding like an angry leaf blower, this is the system to beat. The fit on 103 Touring bikes is precise, the chrome is deep, and the removable baffle means you can run it more civilized around town and pull the baffle for an open growl when you want it.
The catch is the same drone that plagues many big bore slip-ons. With the baffle removed, some riders notice a resonant hum at a narrow band of cruising rpm that can get tiring on long stretches. Keeping the baffle in place largely solves it while still sounding fantastic. As with any slip-on, plan on a tune to keep the air fuel ratio safe, because the 103 will run lean once it can breathe this freely.
- Signature deep Rinehart rumble that owners consistently rate as the best tone
- Removable baffles let you tune the loudness to your taste
- Available in chrome or black with multiple end cap styles
Pros: Arguably the richest, most musical exhaust note in this group; Excellent fit and finish that feels worth the investment; Baffle options give real control over volume and drone
Cons: Can drone at certain steady highway speeds with the baffle out
3. Bassani Xhaust Road Rage 2 into 1 System: Best Full System
When you are ready to stop tweaking and actually unlock the 103, a full two into one like the Bassani Road Rage is where serious power lives. By replacing the entire header along with the muffler, it removes the factory restrictions that a slip-on simply cannot reach. The stepped tubing is engineered to keep exhaust gas moving fast, which fattens up the midrange torque that makes a heavy bagger feel lively in real riding.
The trade-off is commitment. This is a header back job, so installation takes longer and you are fully replacing the stock plumbing, which means a proper tune is mandatory rather than optional. The single muffler also gives a different, more focused tone that traditionalists who love the classic dual pipe rumble may not warm to. For riders chasing the most usable power and a tucked, modern look, though, it is the standout full system on this list.
- Complete header back system rather than a muffler swap for bigger gains
- Stepped header design tuned to broaden midrange torque
- Tucks tight to the bike for improved lean clearance and a low-profile look
Pros: Strongest top end and midrange gains of the systems here when tuned; Aggressive single sided look that cleans up the bike; Noticeable weight savings over the dual stock setup
Cons: Full system install is more involved than a slip-on; Single muffler tone is not for riders who want classic dual pipes
4. Cobra Speedster Slashdown 2 into 1 Exhaust: Best Value
The Cobra Speedster Slashdown proves you do not need the most premium badge to get a real performance gain on a 103. As a full two into one, it opens up the engine far more than a basic slip-on, and the lean slash cut styling looks right at home on Dyna and Softail platforms. For owners who want the breathing benefits of a complete system without stretching the budget, it hits a genuinely smart balance of price and capability.
Where it gives a little back is in the finish details. The chrome and welds are solid but not quite as flawless as the boutique brands, and the tone leans rawer and more mechanical, which some love and others find a touch coarse. None of that hurts how it rides. Bolt it on, add a tuner to dial in the fueling, and you get a lively, better breathing 103 that punches above what you paid for it.
- Affordable full system that still delivers real breathing improvements
- Classic slash cut styling that suits Dyna and Softail lines
- Lightweight single muffler design that drops mass low on the bike
Pros: Strong performance for the money compared to premium full systems; Old school slash down look that fits cruiser styling; Good midrange pull once paired with a tuner
Cons: Chrome quality is a small step below the premium brands; Tone is rawer and less refined than higher end systems
5. Screamin' Eagle Street Cannon Slip-On Mufflers: Best OEM Fit
For owners who want a performance bump without leaving the Harley ecosystem, the Screamin Eagle Street Cannon mufflers are the safe and clean choice. Because they are engineered by the factory, the fit is dead on, the heat shields line up with the rest of the bike, and everything bolts to the original mounts without fuss. Pair them with the matching Screamin Eagle air cleaner and tuner and you have a cohesive stage one package that your dealer is happy to support.
The honest limitation is that factory restraint cuts both ways. These are tuned to be loud enough to satisfy without crossing into ticket territory, and the performance gains are real but on the conservative side compared to aggressive aftermarket systems. You are also paying a premium for the brand and the OEM integration. If confidence, perfect fitment, and warranty harmony matter more than chasing every last decibel and pony, this is the slip-on for you.
- Designed by Harley to integrate cleanly with the stock heat shields
- Plug and play fit with factory mounting points and hardware
- Tuned to pair perfectly with the Screamin Eagle stage one kit
Pros: Truest factory fitment and finish of any option here; Dealer support and warranty friendliness for owners who value that; Predictable, well mannered tone that is loud but not obnoxious
Cons: Gains and volume are more conservative than aftermarket pipes; Premium pricing for a slip-on level upgrade
6. Python Throwback 2 into 1 Exhaust System: Best Classic Look
The Python Throwback is the pick for the rider whose 103 build leans nostalgic. It pairs the real breathing advantages of a full two into one with styling that nods to classic cruisers, so you get more than a cosmetic muffler swap while keeping a vintage silhouette. The chrome and shape are designed to blend into retro themed bikes, and the tone is mellow and pleasant rather than aggressive, which makes it an easy companion for daily riding.
It is fair to say performance is good rather than class leading. The Python moves more air than any slip-on and frees up the engine nicely, but the most aggressive full systems on this list will out-pull it on the dyno when both are tuned. If you are building for a balance of style and breathing, and a smooth, livable note matters as much as raw numbers, the Throwback earns its place. Riders chasing maximum output should look to the Bassani or Vance & Hines instead.
- Vintage inspired styling for riders building a retro themed 103
- Full system breathing benefits in a classic two into one layout
- Chrome finish tuned to match old school cruiser builds
Pros: Distinctive throwback styling that stands apart from modern pipes; Full system gains over a basic slip-on swap; Comfortable, mellow tone that is easy to live with daily
Cons: Performance is solid but trails the top full systems here; Retro look will not suit riders chasing a modern aesthetic
7. S&S Cycle Grand National 2 into 2 Slip-On Mufflers: Best Race Inspired
S&S Cycle is a name that performance Harley owners trust, and the Grand National slip-ons bring that race derived engineering to the 103 in a traditional dual muffler format. The baffle work comes from S&S competition experience, so you get crisp throttle response and a controlled, purposeful tone rather than just noise. For owners who want the twin pipe look kept intact while leaning on a serious performance brand, this is a compelling and slightly different choice from the usual suspects.
As a slip-on, though, it shares the same ceiling as the others in that format. It improves flow and sound over stock but cannot reach the gains of a full S&S header back setup, so view it as a tasteful breathing and tone upgrade rather than a big power play. The finish options are also a little thinner than the mainstream catalogs offer. Tune it properly, keep your expectations slip-on shaped, and the Grand National rewards you with character and quality.
- Race developed muffler design carried over from S&S competition work
- Dual slip-on layout keeps the traditional twin pipe look
- Tuned internal baffle balances flow with a controlled sound level
Pros: Performance pedigree from a respected engine and exhaust builder; Keeps the classic dual pipe appearance many riders prefer; Strong, crisp tone with good throttle response when tuned
Cons: Slip-on format limits gains versus a full S&S header system; Fewer finish and end cap options than the mainstream brands
Frequently Asked Questions
Do I need a tuner after installing a performance exhaust on my Harley 103?
Yes, in almost every case you should add a fuel tuner. The factory 103 is calibrated for the restrictive stock exhaust, so once you open up the breathing with a slip-on or full system, the engine runs leaner than it should. A lean condition raises heat and can rob you of the very power you are trying to gain, and over time it adds wear. Pairing your new exhaust with a high flow air cleaner and a tuner, the classic stage one combination, is how you turn a louder bike into a genuinely faster and healthier one.
Will a slip-on or a full exhaust system give my 103 more power?
A full system will always have the higher performance ceiling because it replaces the head pipes where the biggest factory restrictions live, while a slip-on only swaps the mufflers. That said, a slip-on is cheaper, faster to install, and reuses your stock header, which makes it the most popular first upgrade. If your goal is sound and a modest bump, a quality slip-on with a tune is plenty. If you want the strongest midrange and top end gains and are willing to do more involved work, choose a full two into one.
Will an aftermarket exhaust fit my specific Harley 103 model?
Fitment depends on your platform, so always confirm the system is listed for Touring, Softail, or Dyna before buying. The 103 engine appeared across several frames, and a header routed for a bagger will not bolt onto a Dyna. Most manufacturers publish clear fitment charts, and the product listings note which models and year ranges are covered. Slip-ons are generally more forgiving since they use the stock header, but full systems are platform specific, so matching the part to your exact bike is essential.
How loud are these performance exhausts compared to stock?
All seven are noticeably louder than the muted factory mufflers, but they cover a wide range. Slip-ons with removable baffles, like the Rinehart and Vance & Hines, let you choose a polite tone with the baffle in or an open growl with it out. Full systems and race inspired designs tend to be the most aggressive. If you ride early mornings in a quiet neighborhood or do long highway days, look for a baffled option that tames drone, since constant resonance at cruising speed is the most common complaint owners report.
Can I install a Harley 103 exhaust myself in the garage?
A slip-on is a very approachable home job for most riders. It usually involves loosening a clamp, removing the stock muffler, and bolting on the new one with basic hand tools in under an hour. A full two into one is more involved because you remove and replace the head pipes, deal with the heat shields, and often need to manage the oxygen sensors, so plan for more time and care. Either way, follow the included instructions, use new gaskets where specified, and remember the tune step before you ride hard.
Our Verdict
For most Harley 103 owners, the Vance & Hines Eliminator 400 is our top pick because it nails the balance of bolt-on simplicity, killer looks, and a deep tone that defines the big twin, and it scales beautifully into a full stage one package. If your heart is set on the richest exhaust note and the most tunable volume, the Rinehart Racing 4 inch slip-on is the runner up worth every bit of consideration. And if you are chasing the most usable power, step up to the Bassani Road Rage full system and commit to a proper tune.
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Video: Related tutorial from YouTube