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Have you had email contact with terry at BMS? Before I installed it on my 125i I emailed him several times about whether or not I would end up with the same power as a tuned 328i. As it was the first one he had supplied for a 125 it was unclear whether it would indeed produce the same amount of horses. As for the exhaust on the two cars, my understanding is that the 328s exhaust is only 1/4 inch wider only at the back. That is the only difference between the engines. Having driven a stock 328 I can tell you there is a hell of a difference between it and my tuned 125. I have also changed the back muffler for a straight through one. Not so much for performance but I found the car way too quiet
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