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Rebel 1100 exhaust: slip-on vs full system — is the header swap worth it?

  • rebel-1100
  • cmx1100
  • exhausts

The Rebel 1100 shares its parallel-twin platform with the Africa Twin, which means deep aftermarket exhaust support. But “more options” also means more ways to spend money without a clear return. Here is how the two tiers compare.

Slip-on: the 90% solution

A slip-on replaces the muffler section only. On the CMX1100, that is the big can that sits under the right side of the bike.

What you get:

  • A noticeable tone change — deeper and more open than stock.
  • 2–4 kg of weight savings (more with a carbon or titanium can).
  • No ECU reflash needed in most cases — the stock O2 sensor and fuel map cope fine.
  • Bolt-on install in under an hour with basic hand tools.

Popular options: Vance & Hines Twin Slash, Cobra 3″ slip-ons, Yoshimura (where listed for the 1100). RevZilla carries most of these with CMX1100-specific fitment filters.

Full system: the 10% case

A full system replaces the headers and collector as well. On the 1100, this is typically a 2-into-1 layout (Two Brothers Comp-S, Cobra El Diablo–style).

What you get beyond a slip-on:

  • Larger power gains in the mid-range — but still modest without ECU tuning.
  • Significant weight reduction (the stock headers are heavy mild steel).
  • A completely different visual profile under the bike.

What it costs beyond money:

  • You almost certainly need a fuel controller or ECU flash (Dynojet Power Commander, VCYCLETECH, or a dealer reflash) to avoid running lean. Budget an extra $300–600 for tuning.
  • Installation is more involved — header bolts, O2 sensor relocation, and gasket replacement.
  • Some full systems change the exhaust hanger geometry enough to affect passenger peg or saddlebag clearance.

The honest recommendation

For most Rebel 1100 riders, a slip-on is the right call. The cost-to-satisfaction ratio is high, the install is reversible, and you keep the stock tune. A full system makes sense if you are already planning a fuel controller for other reasons (air filter upgrade, altitude tuning) or if you genuinely want the weight and look of a clean 2-into-1 under the frame.

Fitment notes

  • DCT vs manual — exhaust fitment is the same for both transmissions on the CMX1100.
  • 1100T touring trim — the hard saddlebags may conflict with some full-system exit pipes. Confirm clearance before ordering.
  • Model year — the 1100 launched in 2021; header-bolt patterns have been consistent so far, but always verify against the seller’s fitment chart for your specific year.

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