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Message: [QUOTE="Cr500, post: 578578, member: 9468"] A billet wheel will be quieter than the cast wheel it replaces. Maybe its the denser material has that effect. I have used alot of billet wheels, in some cases just a replacement for what was there. Every time the actual high pitched whine was muffled by the sound of the compressor pulling air. I have a 96 that had a cast 38r wheel, about 3 1/2 months ago switched it to a billet. Same results, went from the normal high pitched whine to now just pulling air sound. It still whines, but nothing like before. In any case, regardless of turbo, if you swap something on the rotating assembly it defiantly should be re balanced. Especially with this billet stuff. These tp38/ gtp38/ 38r turbos have 6mm shafts. 30 psi is something close to 100 thousand rpm. So most just swap the wheel out and go down the road? Yikes. [/QUOTE]

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