I have a 2011 3.7 and was thinking of getting headers put on it, I have read of 25 to 30 HO increase. Anyone went this route and have information or maybe information of shops that do this in the East Kentucky area.

 

You will not see 25-30 HP increase without alot of supporting mods. Shorties with cat-back, CAI, and tune might get you close to those numbers. But not just with headers.

Real world gains for shorties are probaly 4-5 HP.

Matthew