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Which exhaust system provides the best level of increased HP + just the right exhaust sounds. I like the looks of the Hamann system, with the upturned exhaust tips. Is there a problem with water collecting in there?? I don't like looks of the single larger pipes a la Hennessey. Anyone got insights into what Dinan will have?? I'm thinking of waiting until their CAI and exhaust components are both ready, and do them together. Thoughts??
 

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My opinion is that you won't get significant power from any of them (my guess, less than 10hp). Try to listen to them in person (Henessey is not really a player in this game)... choose good construction, and try to get dyno sheets to prove that there isn't any power loss. Dan
 

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I'm going to have a new exhaust installed on Thursday. It is done by a specialised company in Germany working only for BMW. I've bought it through Digit Power in Switzerland.

The key to have a good sound is to buy a not-certified (homologated) one. Mine will be looking as stock except it'll be better quality stainless steel, but of course the sound will be much different. I'll post soon.
 
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