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Originally Posted by harryrcb
I have played around with my exhaust as well, started with my 97 2.5, put ebay headers on. really felt the difference then I bought a 04 S so immediately put on the ebay headers. felt absolutely no difference, a slightly better tone but that was it,
Next I flashed the DME and added cold air intake with some great results. in an effort to make it better I eliminated the mid cats and added a Borla muffler, sounds great but definately lost that low and mid range torque.
since I put then on together I dont know if it was the elimination of the mid cats or the Borla muffler? WHAT DO YOU THINK?
BTW I just removed my headers to have them ceramic coated and noticed that Borla welded a venturi shaped piece of metal in the intake side of the muffler that really reduced the size of the pipe, I'm wondering if that has anything to do with the loss?
ANY opinions will be greatly appreciated  |
If I am understanding things correctly, its seems as though you have gone completely catless. If that is the case, then you have eliminated virtually all of the back pressure from your exhaust system. That would explain why you have lost so much low end to mid range torque. I would suggest putting the oem headers/pre-cats back on, and eliminate the secondary cats. By doing so, you will regain some essential back pressure, at the same time open up the flow of exhaust further down stream and shed some unnecessary weight.