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Re: E28 M5 headers (archive)
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Posted by Matt Evans on May 29, 2001 at 12:29:56:

In Reply to: E28 M5 headers posted by Byron Dorey on May 28, 2001 at 16:10:17:


I'm wondering what is available in the way of replacement headers/downpipes for my E28M5? (the exhaust system is a Metric Mechanic free(r) flowing system)

Exhaust work on US model E28 M5s is basically stupid.

Arguably the most important performance-related component of an exhaust system is the manifold. US cars got the shitty dual 3-stub manifold. Euro motors have proper engineered-length headers (especially important on straight six motors!!) that help evacuate spent charge by creating timed pressure waves within the pipes.

The only differences between US and euro motors are these headers and the motors compression ratio.. yet you get a 30hp difference.

Problem is, euro headers are, iirc, $1200.

In any case, if you put euro headers on your motor, (and tune the rest of the exhaust to match) expect a nice improvement.

Otherwise, you can do whatever you want to the rest of the exhaust system but it will basically be a really expensive volume knob with one setting. If (like me) you started having people do exhaust stuff to the car without thinking it through, you'll go through a lot of money, and end up _robbing_ your M5's performance.



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