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My 16' 340i got the MPPSK installed three weeks ago and thinking to install a Catless or high flow catted downpipe, based on ur experience I will go with the high flow catted downpipe and void all the trouble, I'm going with the bm3 (apparently they have a tune specifically for the MPPSK, still have the MHD license stg 1 but no MPPSK tune for). SOS any suggestions please!!!! thanks
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