a while back i posted that i was getting some pinging with my 93 sc. and it was suggested that i put my stock maf on , as i was running a 76 mm c/l , anyways i hadnt noticed any pinging until yesterday i had to pass a tractor trailer to get off my exit and noticed it bigtime. now this has me a bit worried because i just had the hg done this past summer. my mods are s-port late model , mp plenum 75mm throttle body, it has stock intake and stock maf. i never bothered to get it tuned for this set up. so my ? is am i asking for my hg to blow again. i can get up to about 12-13 pnds of boost and not hear it other times i can only go part throttle and hear it. i always use shell 93 octane , and the car doesnt have any vacum leaks she runs smooth.