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Discussion Starter #1
Has anyone upgraded their exhaust system for the 350d with particular regard to extractors. Was the power and fuel efficiency noticeable and ultimately worth it?

I am not keen on chipping the engine until after the warranty expires so extractors/exhaust upgrades in the interim is an option. Keen to hear any experiences anyone has had going down this track. I assume the factory exhaust system is reasonable to begin with?
 
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