The exhaust manifolds on these engines are a horrible design. Just a log that the ports dump into. I am sure that even shorty headers would provide some good gains on power and mileage over the crappy stock manifolds.
I have not been able to find any listings for the '08 and up engines.
I know that the heads are different but I am wondering if the port shape and spacing might still be the same?
Anyone out there got any ideas?