Quote:
Originally Posted by omasou
Quote:
Originally Posted by Poochie
With that logic, spacers should work on a catless downpipe without any issues then.. Which it doesn't..
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I'm not an expert. If they decrease the cat material and move the O2 sensors out of the exhaust flow a proportional amount then the sensors should continue seeing what they expect.
If you remove the cat entirely then there's not decrease between the sensors or the lower sensor would have to be so far out that it's not feasible to construct a hatless pipe that way. |
I kind of understand what saying but I know for a fact the N55 is very sensitive to any emission flow changes; there is no way that said construction would adequately work without having a close-to-stock catalyst restriction.
And FS only claims a 20hp increase "with a tune." My theory is the louder exhaust sound with a sports DP is what fools folks into believing it's producing more power.
If your vehicle is new and has a proper functioning stock cat, there is only so much to gain with a catted downpipe, beside the raspy sound.