i have a 2007 SI, and am looking for more ways to get this thing faster? please let me know if you have any suggestions besides forced induction. i am not trying to get into a turbo until the warranty on the engine is up... so far i have everything listed below, and looking to add more ASAP. thanks in advanced for your help.

 

cams, thin head gasket, mill the head, port and polish, high compression valves, ????? or convert to obd1 and get a tune, (not from the dealer). when taking car back to dealer, switch back to original ecu

 

Anything else other than what you have done will void your warranty.