When I bought my 06 I5 H3 it had a CatBack Magnaflow system on it. I am now getting CatConv codes and seeing as how the 1st cat is built into the manifold, I was thinking about replacing it with a Magnaflow Header. Anyone out there in the great outdoors (aka HummerLand) running a full front to back MF Exhaust System?

Interested in knowing if it will become much louder than it already is?

Will there be any noticeable HP or MPG gains?

Inquiring minds want to know.. Any advice will be appreciated.

Thanks, Chuck

 

Moved from the Drivetrain Area, where it says: This section is an archive of older posts, please post new questions in the specific model section. Thank you!