Quote:
Originally posted by sammyg2
On a stock engine does an aftermarket exhaust system really make much difference besides noise?
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Apparently, anywhere from ~5 HP to ~10 HP, depending on a whole raft of things. On a modified engine, potentially much more....
The stock setup isn't exactly equal-length, and the only place the exhaust streams meet is inside the muffler. I don't think there is any real kind of "collector" built into the muffler either.
...Unless we're talking the 75-76 setup, which really chokes a stock 2.0 down from 95 HP to 88 HP. Unequal-length stuff again, with very very short primaries, then making an immediate tight 180-degree bend--not exactly good for power.
--DD