[jdub486]

I am looking at a used e90 m3 with the ESS g1+ kit on it. The car has stock cats. Someone bought it a few months ago and returned it because apparently it won't pass emissions. Does this make sense for a car with stock cats? Any insight to why it won't pass? I thought these kits were TUV clean and would certainly pass emissions with cats in place. I don't want to buy the car and then have to remove the ESS kit every 2 years.

Do any tuners offer a no boost tune that would pass emissions?