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      02-06-2012, 09:09 PM   #43
richb811
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Quote:
Originally Posted by Keanu111 View Post
Hey, how much is the expected gain on these with the catless ones?
Keanu111

It depends on the tune but you can expect a minimum of 15hp/15tq.

Some N54's have seen around 25/30 hp/tq figures. If you take a look in the E90 335i Engine tuning section, you'll be able to see a lot of dyno sheets with the results confirming these numbers