Quote:
Originally Posted by 200Duece
getting newer engine software for your diesel engine with a more open exhaust will give some pretty dramatic performance gains
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+1
I don't know anything about these guys, just did a quick search and it seems they offer ECU flash units that can bump a 320d up by 40hp and 75ft/lb torque:
http://www.e90post.com/forums/showthread.php?t=253564
There are probably at least half a dozen other companies out there that do this too, but just to give the OP an idea.