The 512 is bigger than my 451 but if using an easy street cam the 800 AVS2 anular is the bomb on mine comming from a Quik fuel billet DP.I have the mopar 528 and the street manors are great. Dont smell the exhaust any more and will rip too.Was suprized how easy to tune it in out of the box , Lights up on the first crank with no choke.