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Factory 4.1 SL – Titanium (Ti) Midpipe
Titanium slip-on muffler with titanium midpipe; same muffler as Factory 4.1 system. Available in natural titanium or blue anodized finish. Fits stock or FMF header.

Factory 4.1 SL – Stainless Steel (S/S) Midpipe
Titanium slip-on muffler with stainless steel midpipe. Available in natural titanium or blue anodized finish. Fits stock or FMF header. - Boosts low-mid torque, broader powerband, more over-rev.

- Features exclusive proprietary Chamber Core technology.
- Factory Forward Engineering centralizes mass, improves handling.
- All titanium construction - canister and endcaps; choice of mid-pipe.
- Made from premium quality American materials.
- Customize with performance tuning inserts and spark arrestor module.
- Meets AMA sound requirements on most models; inserts available for others.

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