Quote:
Originally Posted by Spyros E81
Here again with new upgrade!
I placed on my car an OEM M135i backbox with new M135i diffuser.The process of the fitment is an easy job bacause the hangers on the backboxes are in the same places.The result of the fitment is like from the factory.Now the sound is more heavy and it's sound like an M135i in gears changes.I will prepare a compare video in static.
Enjoy them with photos
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The exhaust muffler looks exactly the same less one tail pipe for the 118i factory installed muffler. But I think the M135i exhaust muffler is different internally for the deeper louder exhaust sound you mentioned.