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      11-03-2012, 10:44 PM   #13
Johnny D
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Drives: 2006 BMW 325i
Join Date: Apr 2011
Location: Hot Springs, AR

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2006 BMW 325i  [4.58]
The X pipe should go as close to the front section of the exhaust as possible. Let me reword that...The X pipe should go directly after the final collection point of the exhaust.

I personally will be running a magnaflow X pipe resonator in the section before the secondary cats.

For an H pipe the location is generally used more for a tuning aspect. It's install location will depend on what tone you're attempting to generate/eliminate.

Very high level information and there is a ton more to it than that, but its the generalization to your questions.