your right on saying why does everyone have a mass air car.. The mass air computers don not take to mods well at all.. And especially a Cam. The guy your talking about I don't think is running low 12's on speed density without many or major hassles. The aftermarket Cam is gunna pull alot of differnt vaccum where your speed density MAP sensor is gunna trip out on.. Also you will have surging to stall problems. that can be fixed with a adjustable fuel pressure regulator cause the stock one closes up with such vaccum and causes your car to stall and surge to death. Its just so much more user friendly and safer to go mass air right from the begining... you can try the speed density but i wouldn't recomend it..
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