Converting a 135i to full 1M exhaust and rear bumper can be challenging. There are a lot of options that can make it a difficult task choosing a way forward.

We put together this customizable kit to try and ease that burden and make converting to a custom exhaust or full factory 1M setup a breeze.

The base relocation kit includes the 1M multifunction tray and positive battery cables required to relocate the battery and achieve the 1M exhaust clearances. The factory 135i tray is
very space prohibitive when trying to run an exhaust exit to the passenger side of the car. The 1M tray gives you plenty of room to run a full 3" tube if you wanted to.

When performing the battery relocation you will have to swap the negative battery cables because of length. You must check first and identify if you car has an IBS sensor connected to the 
negative terminal/cable from the factory. If it does not you can use the less expensive brown cable. If it does you must select the black cable with adapter.

Fuel vent lines must be replaced because the mounting position of the charcoal canister will move with the change in battery tray. These lines sometimes go in and out of availability from BMW - please contact us to inquire about specific availability of these if we do not show them in stock.

We have included two options for exhaust provisions - either just the shield conversion necessary to properly shield the new 1M battery tray, or full provisions including the rear bumper carrier with 1M exhaust hangers.

Lastly you can optionally include the factory foam insert with emergency provisions for a flat tire.