Quote:
Originally Posted by Grips&slips
So I just ordered the 2.5" catback I'll let you guys know what I think about fitment and drone. I'm hoping it is very quiet for aftermarket exhaust.
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2.5 cat back is near on the same as stock with no drone, I wouldn't bother swapping if staying NA as the X Force cat back weights more than stock.
As stated, I then got the 2.5" overpipe back section with a highflow cat and resonator, still no drone, exhaust did get louder but still not obnoxious.
But, with a punched out cat in the OEM header, a 2.5" ULTREX (cheap) overpipe through X Force front pipe with the high flow cat punched out then the X Force cat back, cold start was obnoxiously loud, but once cold start was over the car sounded loud when you got on it, but in a good way, nice and respectable just cruising around though.
Tune fixes cold start.
After a tune it's all roses.
If I was to do the exhaust again for a NA 86 daily:
1. Punch out OEM header cat
2. 2.5" overpipe
3. 2.5" midpipe with resonator, no cat
4. Tune
5. Skids
6. Beer
My thoughts on highflow cats: they still cause a restriction, you will fail a test, unless you tune on E85 for the test.