What are your goals time wise for your car?
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I've got an 04 gtp as well with only a 180tstat, k&n drop in and a new fuel filter as well. I just bought a pulley puller because for cost effective hp gains I was going to go with intake, 3" downpipe, tune and 3.5" pulley then scan. in that order.
I didn't think you needed valve springs and rockers to go with my plans above.
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