I have a 2001 F-550 4x4 automatic with 4.88 gears and it's over 10,000 lbs empty. It is stock other than a 4" diamond eye exhaust and 6637 air filter.

It's been a dog ever since I bought it, it runs fine just not impressed with power. Installing this Riffraff wheel made a VERY noticeable difference, the boost coming on earlier makes pulling out of stop signs and in-town driving MUCH better and going up steep grades on the highway it feels like a whole different truck. I might not even bother putting a tuner in it now, it's much more pleasurable to drive. It is a bit louder though, the intake screams like a jet engine when pulling hard up a grade but I don't mind that for the gains. Highly recommended!

Install was super easy and it looks great, still finishing up my motor before I can test it but it looks great and I bet will preform great

It seems to make my truck run better, time will tell on pulling a load up hill to see if it stops the turbo surge, but it sounds friggin awesome and the waste gate dumb is way less annoying.

My 02 is stock and has 99k miles on it. I bought the wheel to cure a slight surge when towing, what I got was surprising.

The wheel has made a noticeable difference in mid-range torque. This is especially felt when applying throttle at highway speed. Throttle response is immediate and the truck needs less throttle input to pull hills than before.

I was skeptical of performance claims but now I am sold.

I had installed 4” exhaust, Donaldson 6637, and hydra. The turbo started producing lots of surge when accelerating quickly and pulling, but this wheel cleared everything up. The truck runs better, produces more boost and seems to have more power.
Thanks for guiding me in the right direction.

Finally installed, And I must say it provided faster spool up , and helped with my turbo surge, Sounds good as well .

There isn’t a whole lot else to say about this wheel that hasn’t already been said but it is a superb wheel that does exactly what it’s intended to do, as advertised and reviewed. Excellent quality, sounds great, spools quicker. If you’re hesitant, don’t be. This wheel will keep a smile on your face no doubt.

I've been buying Riffraff stuff for years and for good reason. It's all top notch stuff. I finally got tired of dealing with turbo surge so I did a full rebuild with this wheel, a KC S300 turbine, and Riffraff's 360 rebuild kit. Everything came packaged well and nothing was missing. The new assembly does take a little longer to spool up but it's probably because of the new turbine weighing several ounces more than the original. Once this thing lights though it's awesome. Boost is higher all around. Max boost is up about 7psi on my 70hp street tune. Pulls great all the way up to red line. Noise is perfect, barely noticeable while cruising at highway speeds but has that nice whistle under throttle. 10/10 recommend this to anyone with stock injectors.

great online and email support with easy to follow instructions. probably my best online purchase and support experience to date.