I'm trying to find long tube headers for my 04 3.9L Auto. Some online sites I've found only offer these for a manual transmission only. Don't know why but if anyone has LT's for a 3.9L auto or knows where to find them Please let me know. I appreciate the help. Also how easy (or hard) is the installation?

 

I believe the 3.9 and the 3.8 headers will match up just fine. No idea about that MT/AT deal. The install is a bit of a pain in the ***.

 

Any idea how much it would cost to have a shop install the headers?

 

Shop rates are all different. But it'd prolly be a couple hundred bucks.

TBH I really don't recommend longtubes unless you're running forced induction of somesort.. unless you're doing it purely for sound..

 

I have also heard that long tubes are a pretty worthless mod unless you are doing some sort of forced induction. On a further note, I also read somewhere that the stock headers (94-04 I believe) are pretty close to aftermarket shorty headers as far as flow rates. If this is true, it means that unless you are heavily moding your car, it would be better to just buy some engine enamel or powder coat and paint the stock manifolds.