Stock Muffler Exposed
01-11-12, 02:52 AM
#3
Hahaha, thanks, I've been wanting to cut one open for awhile.
As a matter of fact, the stock muffler (cat-back) is very restrictive, albeit quiet. It is much more restrictive than the FD main cat/midpipe and flows similar to the stock precat/downpipe. Yuk.
The point here is if you're looking for performance, the stock cat-back should be the second exhaust piece to be replaced--the first, of course, is the stock precat/downpipe. If you need a cat, keep the stock main cat as it is actually fairly high flowing, even with its 2-1/2" pipes. The reason for this is that it has high quality catalyst bricks that have a rather large cross-sectional area--significantly larger than most aftermarket 'high flow' cats.
As a matter of fact, the stock muffler (cat-back) is very restrictive, albeit quiet. It is much more restrictive than the FD main cat/midpipe and flows similar to the stock precat/downpipe. Yuk.
The point here is if you're looking for performance, the stock cat-back should be the second exhaust piece to be replaced--the first, of course, is the stock precat/downpipe. If you need a cat, keep the stock main cat as it is actually fairly high flowing, even with its 2-1/2" pipes. The reason for this is that it has high quality catalyst bricks that have a rather large cross-sectional area--significantly larger than most aftermarket 'high flow' cats.
01-11-12, 08:24 AM
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01-11-12, 09:32 AM
#8
If you need a cat, keep the stock main cat as it is actually fairly high flowing, even with its 2-1/2" pipes. The reason for this is that it has high quality catalyst bricks that have a rather large cross-sectional area--significantly larger than most aftermarket 'high flow' cats.
That picture of the stock catback is very revealing. Thanks for posting it.
01-11-12, 02:51 PM
#9
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Ivan and I took a hammer to a dead muffler to see what was in it, and the outer skin is just thin gauge metal, and so are the baffles, the only substantial parts are the front and rear ends which are either cast or machined.
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