HMF headers for a raptor vs stock headers??

[rider1169]

Is the HMF header for a raptor wider in diameter than the stock head pipe?

[KEVIN/HMF]

yes, it is a lager diameter stepped head pipe. The pipe starts at 1.25, then steps to 1.5 and enters the canister at 2.0 inches. This design generate an additional 4 hp increase on the top end of the power band.