what pipe makes the most hp for the pred,HMF,fmf t-4,or lrd.with jetting /air box mods

 

have the wb, but you need to do airbox mods, haven't seen others, only heard of them.

 

I dont think there's ever a thing as "the best". I think its a matter of preference.

 

I know the HMF produces nice gains, but this last weekend we pointed the noise meter at Pudljumpers, even with the quiet core installed, it was well over 100 db. Also aimed it at the HPD prototype, even louder yet.....both make HP, just if you are running in a noise sensitive (metered) area, you probably want to stick with the W/B Pure Polaris unit.