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have a 99 powerstroke my ? is would an airaid throttlebody spacer and a x-wheel make alot of difference in the way the truck runs
The spacer, you're referring to that goes in the IC tubing before the intake spider, will do little for you; other than lighten your wallet. The X-Wheel, aka Wicked Wheel, benefits you while towing by reducing compressor surge. If you have the early '99, it may already be equipped with this type of compressor wheel from the factory.
Also, like Jim said, more air and a larger exhaust would help significantly.
I think its been out for a few years, I remeber having this conversation in another thread here.
Notice when you click on the dyno link it says "coming soon", IOW, It donesnt do squat.
might need a cyclone for the cool side, I think there is still one hanging from a tree in a campground in TN