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For starters you don't have what you say you have.
"headers all the way back......"
Headers are pipes that extend individually from each exhaust port. they typically form into 1 pipe.
IF you REALLY had "headers all the way back" there would be 4 pipes going ALLLLLL the way back. There is only one pipe.
So you have headers. period. stop
you do not have a "cat back'. UNLESS there is/are CATalitic converter that we cant see right after the header that we can't see.
A "CAT BACK" exhaust is an aftermarket system that is designed to keep the catalitic converter in place.
From the various posts it SEEMS like you have a header, attached to a staight (no mufflers along the way) pipe and then some type of ricer muffler/glasspack on the end.
If infact that is what you have
and your goal is to get good gas mileage
what you have is crap.
If that pipe is bigger than 1.5 - 1.175 dia. there is NO backpressure. THat may be fine at wide open throttle but will do NOTHING for mpg
And the poster that said 'my buddy installed headers.......' well...........
Shortys, what? and what size pipe?
My Q45 has factory headers.......so whaT? I also have 4 cats.
You cant make blanket staements about the addition of one part that requries other parts to make it work.
And you REALLY van't post a 'poll' to decide what will work.
1. go do a test run. you have a scangauge right? run 10 miles at 45, 10 at 55 10 at 65. write down the #s. rpm, temp, mpg, load, hp
2. pull the plugs. the tips can show if there is scavanging
3. find the website that has the air intake air exhaust calculator
4. then post up
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