i got this mac tuned pipe for my nitro hammer but i changed my mind after i test ran it in tc31..during intallation i need to cut the header as shown in the pics just to accomodate, i also removed the ring/holder whatever u call it, not a big deal just widen the hole and i can put it back, it's now longer by 1 in. compare to the stock, measured from the plug to the widest part of the tuned pipe, so last minute decision i sneaked to the pond and tested, just my observation it's more quiter and muffled in sound and the most is it adds speed, my topspeed for today is 36mph[8D] and most run will stay 33-35mph,,,,,Dodamissc, u better do something i'm 1 mph behind u dude
....still 40 mph is not far away!!btw, i'm running 25% nitro with x440/3.