does anyone know how big the openings are on the helix and/or alphawerks testpipes?? please let me know asap if you know. thanks in advance~jason

 

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does anyone know about the alphawerks diameter??
the helix is 2.25 thanks david.

 

FYI the info he listed was for Hi Flo Cats but yes they are 2 1/4. There is a hint of rasp with a turbo on cold nights under WOT.