[mikekilpatrick]

Has anyone located BMW installation instructions for a E90 Sedan, specifically for a 2008 328xi?

What are the torque values on the bolts for the system?

I did a cat back on my 2002 STS seville with a corsa exhaust and they had bolt torque specs on all the bolts. I can't seem to find this information anywhere and the dealer did not have them either.

SOME BMW Engineer went to college for 8-12 years and spent time not only designing this system, but ALSO creating installation documents. Where are they? Can anyone please help?

Thanks...

[philsteroni]

The hangers don't need to be torqued, just hand tightened. The exhaust clamps have their torque spec written on them (40nm if I recall..).

[mikekilpatrick]

Thanks for the information! Does anyone know why every Performance exhaust made for the Sedan E90 has LARGE dents made in the exhaust pipe? I thought at first the pipe was damaged in shipping, but two dealerships and checking other Performance exhaust boxes showed that they are all like that. Is it some sort of manual tuning of the exhaust flow or noise done by BMW?

[DimSum]

Originally Posted by mikekilpatrick

Thanks for the information! Does anyone know why every Performance exhaust made for the Sedan E90 has LARGE dents made in the exhaust pipe? I thought at first the pipe was damaged in shipping, but two dealerships and checking other Performance exhaust boxes showed that they are all like that. Is it some sort of manual tuning of the exhaust flow or noise done by BMW?

some kinda flow and to make sure the pipe has enough clearance from the ground.