I spent $450 on modding the OEM exhaust last year and I loved the sound of it. Now that I've got an aftermarket exhaust, I am looking to swap my modded exhaust with the OEM unmodded one plus money.
The OEM exhaust has to be for E90 and in good functional condition, I will be looking at around $350 cash.
Here's a video for reference - It actually sounds a tad louder than my aftermarket exhaust and I kinda regret buying the aftermarket .. but now that the work is done. I just have to sell one.