I just wanted to let you know b/c I was also hessitant about getting gears installed, but now after the fact I wish it would have been my first mod. I can't find any reason not to have them installed.
I've heard that a set of complete factory 99+ heads cost around $700. Someone correct me if I'm wrong b/c I'm also in the market for them.
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1997 GT Flowmasters,K&N,3.27 gears
RedSOHC