I have a late 99.5 PSD with the 6spd. I have the 6637 intake and getting ready to do 4 inch downpipe into 4 inch pipe straight dumped in front of the rear tire. For what I do the truck has plenty of power. I dont really know if I get compressor surge or not? Dont know what it sounds like. My question is will a wicked wheel give me any benefit with the simple mods im doing? Im always about more turbo sound so does the WW make it any louder? does it hurt fuel mileage? Thanks!