Hey people im hoping for some help here, i took my skyline r33gtst to get minor work done and just its regular check up.. The mechanic told me he noticed the car was miss- firing, ( bare with me as im not all that knowledge based with cars) he put my hand up to a small pipe that was blowing out air in small bursts, then put my hand up to the exhaust.. I couldnt quite understand what he was on about, but basicaly told me one of my piston rings is cracked or broked meaning my car is running on 5 cylinders, not 6. He told me the engine has to be pulled out and needs new pistons... Im just wondering if theres an alternate explanation for what hes telling me is wrong, or is there a way i can test my car to get a 100% notibility with what the problem actualy is or if theres a problem at all, i personaly didnt know anything was wrong with my car before he told me it needs major work done, it runs beautifuly. So any feed back would be greatly appreciated, cheers