Hello: I want to increase compression by swapping pistons. My car is a 98 civic, standard engine D16Y7. I dont want to do head shaving-porting-etc. I just want to increase compression, and install a header and a Cold air intake. I`ve been looking around for information, and these are the pistons I can put into my cr to increase compression... - PM3 - PG6 - Bisimoto 75.5 mm I would like to know which one would be the most advisable swap. Thanks for your help. Regards.