I am having trouble deciding what exhaust pipe to purchase..it's between White Bros. E-seris or Pro Ciruit T-4...I have a 2002 300ex and do mainly trail riding...I know I have to rejet when I get a new pipe and I also plan on getting a K&N filter...what pipe do you suggest between these and WHY??

Personally i like the t-4 i think it sounds the best, and gives you the best power for the money. But the e-series is much more adjustable for sound and gives slightly better power output.

i too was trying to decide between theese two pipes ......i chose the t-4 because you could buy the end piece of your choice for your riding conditions......and like ex master said...i think it sounds better, and sure the wb pipe has a slightly better peak power but in the 4000 rpm range for the 400ex the pro circuit blows the e series away...it has like 4 more hp