its like going from a 4.10 to a 3.73 rear gear(not exactly but its gives you the idea). unless you NEED them for the 60 foot or to not run out of gear up top. they will slow you down. maybe ~.2ET and 2-5mph Roughly! but for free and for fun who gives a shit!
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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