i'm shocked too. chirping tires on an auto is...pretty hard to do. as for the more power, you're really limiting yourself by ruling out NOS and turbo/super chargers. NOS isn't all that expensive anymore, it's about 400 for the entire kit (if you know where to look for it: http://www.harleynace.com/ ) and it's about 100 to install or you can do it yourself for a fun weekend project. other than that, i danno about a good power boost.
get thinner tires
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