Imprtracr1
03-31-2008, 08:10 PM
Those of you with Downpipes, and Test(Race) pipes bolted on, Have you seen a dramatic loss in fuel mileage? I know I get crappy MPG as it is, but the car is tuned rich out of the factory. I know its not about the MPG's with our ride, but damn It! Premium ain't cheap. Anyhow, I was wondering since the cat would be off and the o2 sensors are reading false values. I remember on my tC after I pulled off the stock Exhaust manifold and put on my Header that my Gas Mileage suffered noticeably, so I threw it back on and got my mileage back. Anyhow, is it that big of a difference that It will kill my wallet on filling up, or is the difference minimal based on the rich tune as it is from the factory... Somebody let me know please.. Thanx(scratch)
Oh, I think i should have mentioned that on the tC the stock exhaust manifold has the Primary Cat integrated into the manifold like our downpipe, then has a secondary cat further down the exhaust piping past the "S" pipe on a tC. I had to have an anti fouler on after the 2nd cat as to not throw a CEL. I remember it didnt run nearly as smoothely either from take off with the header and Antifouler. Anybody having similar problems with the Downpipe and Test/Racepipe on the MS3? Or is it smoothe sailing for the most part?
Oh, I think i should have mentioned that on the tC the stock exhaust manifold has the Primary Cat integrated into the manifold like our downpipe, then has a secondary cat further down the exhaust piping past the "S" pipe on a tC. I had to have an anti fouler on after the 2nd cat as to not throw a CEL. I remember it didnt run nearly as smoothely either from take off with the header and Antifouler. Anybody having similar problems with the Downpipe and Test/Racepipe on the MS3? Or is it smoothe sailing for the most part?