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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Exhaust drone with borla and a auto?



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      03-09-2012, 09:07 PM   #23
BlueLion
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Quote:
Originally Posted by HP Autowerks
Check the clearance between the cross-over section of the exhaust and the chassis brace. Most shops will secure the exhaust as is sits may cause the cross-over pipe to come in slight contact with the chassis brace. Pre-load the system with a spin jack, then secure all the clamps, that usually does the trick.

How many miles did you put on the exhaust? There is a break-in period for the Borla system.

Harold
OP check what Harold said, I had this same issue and once fixed the drone is bearable and the trim pieces in the car stopped rattling. and I drive an auto
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      03-10-2012, 10:21 PM   #24
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Originally Posted by BlueLion View Post
OP check what Harold said, I had this same issue and once fixed the drone is bearable and the trim pieces in the car stopped rattling. and I drive an auto
Tks Bluelion. I don't quite understand the second part of what Harold say. What does "pre-load the system with spin jack" exactly mean? I assuming this would solve the vibrating noise which sounds like something is vibrating? Tks again.
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      06-09-2012, 02:35 PM   #25
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anyone use Magnaflow 11379 instead of secondary cats to eliminate drone
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      08-13-2013, 12:53 PM   #26
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i've seen others use exhaust venturis as well to eliminate drone
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