Five months ago I installed B&B tri flo exhaust on my 2003 325i. First 3 to 4 months sounded great, then I installed K&N cold air filter and exhaust became louder. I replaced K&N with the origin filter. Exhaust sound did not get better, itís getting louder and louder and my car is shaking when I accelerate on the low speed, pretty annoying. I heard that they get louder after some time, but mine is too loud.
Does anyone have same problem?
I am thinking to put back origin exhaust.