Maybe I'm thinking of Corey...so by stock parts you me no free-dup exhaust at all? Eek! FWIW, if I were to do it all over again, I'd go with headers and a Borla system. Although, if I were you Sam, I probably wouldn't f**k with the oil cooler/header problem and maybe go true dual (w/ two cats of course) Again, nice car, nice wheels, good work!