unitedBMWonline.com is proud to offer you the sound inside the cabin after installing the 135i Performance Exhaust. It is not very noticeable, even the radio can drown it out. The install should take about 30 minutes to 60 minutes. You will have to cut (like any other BMW Exhaust Install) the first set of resonators off, and replace it with the piping and muffler provided with the BMW Performance Install kit.
If you are a current 1 series owner, we offer this exhaust for the 128i and the 135i.
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Daniel Miles
unitedBMWonline
is this a automatic transmission your driving? its not a manual Transmission right?....
ChicanoLX805 3 years ago 2
Yep, it's an automatic
UnitedBMW 3 years ago