Originally posted by: redgtxdi
Insane,
Thanks!! Wow, that's a lot of MPG. I'd assume your pipes had somethin' to do with that too, but that's still quite a hop!!! Good 4U!
I might do the swap just to say I could measure & tell for sure myself.
Nah, the pipes were the same size as what came off, and other than the X design having slightly less backpressure than the traditionaly "H" design, I doubt I'd get more than a 1/2 to a mpg on the highway from the pipes alone.