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I heard that it's too much backpressure. Makes the car extremely jerky at slow speeds. It's a 320i G20 though.. so no xHP yet to do a TCU tune.

I have a high flow catted downpipe already installed together with the stock exhaust but am still running on Stage 1. Am afraid that Stage 2 will make the car undrivable at low speeds and low rpms.

Hello. Is this a very big jump? Need some help from experts..

Can consider Esatto or GZ plug and play for BMW as well :)

Hello fellow Z4 kakis... Recently took the plunge and got a 12 year old Z4 E89 as a 2nd car (because the Nissan Kicks was too boring). Anyway, had the honour to meet AC and admire his beauty. Don't have any pictures of the car yet as it's still in the spray shop (maintained the same Deep Sea...