u/riverrum33

Is there anyway to know if your 330i is tuned ? For context I bought the car with a catless downpipe, a custom exhaust and it doesn’t have a check engine light, I asked the previous owner if the car had been tuned and he said “idk maybe the previous owner tuned it “ so now I’m waiting for a dyno but before there is there any clear signs the car has been tuned ? Also I haven’t driven one before so I can’t compare how it feels to one that’s definitely stock

Hey everyone, just picked up a 2016 330i Msport with 60,000 Km

The car has a vibration when you accelerate hard and in general when you reach 60km an hour is shakes for a few seconds and goes away, it’s very noticeable, the previous owner told me it was the rear coupling (guibo) I took it t my mechanic and he told me it’s not that he said the car has a brand new tail shaft and is really clean but he can’t figure out what the issue is, anyone had this problem or knows the solution? Keep in mind the car has a catless downpipe