Quote:
Originally Posted by Crash
Material-wise, it's just metal. But the idea is that they bend and test every bend to it's performance, quality, flow, and durability.
If you just put any pipe through, it'd be a guess as to whether or not you'll even benefit from it.
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True, but the question was if it would affect smog, which it shouldn't. Now if your talking performance gains; then pipe diameter, bends, baffling will all affect performance.