So i have a 2011 challenger 5.7 6 speed manual with STP. The guy i bought the cat from said that the engine was not a vvt. Is this possible or is it because is a6 speed? I want to put a bigger cam n such in but not sure what to order. Thank for any info. Oh and now my trans is sticking in first gear at random times... any ideas on that?!?!?!?!