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Exhaust sounds awesome, just a heads up though, the reason why your smoking still is your suppossed to run it to redline to make sure you get it all out, I did mine in my 325i at about 190k and it was rediculous, I went up and down my street twice and it looked like the neighborhood was on fire, you could barely see, than Did a pull on a main road near my house from first through 5th all the way to redline and when I pulled back in my driveway no smoke and the motor ran so good, i definetly felt a seat of the pants increase.
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