[Fattony305]

Trying to decide between 6.4 exhaust manifolds or BBK 40460 ceramic coated long tubes with round ports, they will be going on my 2012 5.7.
Looking for options form anyone that may have any experience with either, I’ve gotten mixed responses about if the round port BBKs will work with my 2012 D ports but they are listed to fit 09-19

Thanks everyone

 

[that_guy]

The 6.4 shorty manifolds have a different size flange than the 5.7 ones, so the 5.7 midpipes won't bolt up unless modified with a new flange.

 

[Fattony305]

Thank you, that’s good to know

 

[djalbin]

The 2012 5.7L has the D shaped exhaust ports in the heads. To get a good seal without exhaust leaks, and good exhaust flow, you want the gaskets and headers to match the D-port shape. Skip any headers with round ports.
.

 

[Fattony305]

Thank you, that’s good to know

 

[that_guy]

09 was when the 5.7 got the eagle heads with D ports.