According to Four Wheeler, the Borla cat back and header combination is very good. An average increase of 10% in fuel economy and an increase of power that ranges from 10% to 30% at peak RPM. Go for it. I will.
Mostly fitment problems. The header ended up having to be heated to get it to fit right, but this was after he forced it on and broke a manifold bolt. Another thing that he mentioned was the exhaust that exits the header ran underneath the oil pan, so he a shop fabricate one that wasn't so close. Apparently he was losing oil pressure because the pipe was to close and boiling the oil. These are some problems he had so I would inspect it closely.
Has 'Four Wheeler' ever met a product they didn't like? And what is
with the guesstimates. Put the damn thing on a dyno and tell me the
truth. What EXACTLY was the horsepower gain? At what RPM? How much
EXACTLY did the gas mileage change?
It's easy to make statements when no one asks for proof.
A forum community dedicated to all off road vehicle owners and enthusiasts. Come join the discussion about performance, engine swaps, modifications, classifieds, troubleshooting, maintenance, and more!