With the RiffRaff wheel I picked up 5-6 psi over stock. Where I used to peak out around 15-16 psi on a stock truck (no chip) I get 20-21 and occasionally 22 psi of boost now. There is little more turbo whistle leading to a more pronounced whistle at 10 psi but above and below that it's reasonable.

Made the mistake of buying a cheaper chinese made knock off. Only lasted 4,000 miles and took out my turbo. Should have just gone name brand and bought this quality one in the first place. Almost 10,000 miles on my new one and running great! highly recommend

Running it now for almost 80k miles, and love it!

Like driving a different truck, well worth the money

I wanted a new wheel to replace the WW1 and looked at them all. After reading all the reviews about RiffRaffs I pulled the trigger and bought it, also rebuilt the turbo... what a difference!!! The sound is slightly softer, more of an air sound than a whistle.. my truck would only pull 24psi prior to the new wheel and rebuild, now the truck pulled hard to 32psi before I lifted!!!
More power, boost comes on sooner and pulls way harder up higher... great job Clay!! Another home run...

Had a ww2 on another turbo. I can truly say that this wheel is a better wheel. Subtle change in whistle and great performance. As always another great product from Riffraff. Clay isnalways greatnat answering questions and making well informed recommendations. Thanks again.

I rebuilt my GRP38 turbo and installed this wheel along with all new gaskets and thrust bearings. This was a true difference maker! The turbo lag is completely gone and I have seen a great increase in my boost pressure. I highly recommend the Billet Wheel!

I installed the wheel along with new donut gaskets and I have noticed a dramatic improvement in performance,from about 2200 to 3700 or so (when it defuels) the truck screams.

I love this wheel made my 97 like a new truck whistle is great thanks again for all the great products you guys sell