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In Reply to: Just ordered Metric Mechanic lightened flywheel- posted by Ethan Turner on February 08, 2002 at 21:59:46:
I'm not sure about the 3" custom pipe. You might want to go larger than 3" single pipe to get the equivalent cross sectional area. Assuming infinitely thin pipes, 3" single is _About_ 16% more cross section than the factory config. single 3.25 or single 3.5 would give you more cross area than stock, but that starts to get big and fat.
Rob levinson has had great luck with dual 2.25", which ends up being larger than single 3, iirc.
You can see my write up of this at:
http://bmwe34m5.com/faqs/?theme=1&level=4&question_id_select=344&chapitre_id_select=50&document_id_select=5
and clutch. Will install at the end of the month. I'll keep everyone posted as to how it goes. Jim at Metric Mechanic was a really good sport about price haggling and including Viton seals.
Exhaust is next. I lan on having a custom 3" single pipe made. We'll see.
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