If you'll do a search here on VDF you'll find a lot of dscussion about the costs / benefits and success of trying to rechrome a Supra. I think many feel that you're better off stripping the remaining chrome and polishing the aluminum (there's at least one beautiful example here on VDF). Or, if you really want chrome just buy a Supra off ebay, or elsewhere, that doesn't have as much of a pitting problem.

I can't really answer the question of sound quality. I had a pitted Supra powder coated and it certainly sounds different than my stock Supra. I also installed tub lugs, single flanged hoops and different heads. Does it sound better or worse, I don't know...just different, and I like it.