Quote:
Originally Posted by JackB316
Thanks for sharing.
I have ARM M550i catless downpipes on my 50i. Perfect fit. Also have the ECU tuned by DME (stage 2). 622 HP and 660 TQ at the crank. I'll be posting something in the coming weeks with more details and information.
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Did you install the downpipes before the tune? And the X pipe? Just curious how that change was. Changing the downpipes mess your warranty up right?