valvebody upgrade
Haven't posted in a while. There about 20 Z's here and one GTM sc on a manual (not surprising cause the SC kit costs here about 12 grand.) I have an automatic and just purchased the Stillen kit. I know there are many opinions about the two kits; it's just that I had the opportunity to by the stillen from someone who sold there car before installing (only 8 grand.) My question is what does the valvebody upgrade do and can I install it at a later time after I install the SC kit. I do not track and rarley drive the car hard. Thanks
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