[CaliE90]

http://www.e90post.com/forums/showthread.php?t=433474

there you go

[CarbonTT]

Originally Posted by Coleharris

This is exactly what I did (JB3 + aFe DCI) and I love it...great sound and great power...plus I unplugged the exhaust in the back and it sounds much better....a better humm and you can hear the difference. It gives your car a better sound without spending 1K on exhaust for 10hp gain. Soon will be adding ar catless downpipes and intercooler...but again if you're on a budget, do things overtime...enjoy each mod for a bit before you're able to do the next mod. Plus it feels like a new car every couple months (or however long you wait)

what do you mean unplugged the exhaust in the back?

[BrianMN]

search "Golf tee mod". Basically it's disabling the flap in the drivers side muffler, to allow exhaust to exit out of both mufflers at idle/low throttle instead of just the passengers' side.