The valvetronic is a straight pipe with valves open and the m performance is just louder then the non m. When it comes down to $$ or value, I would go valvetronic but then again some people say the m performance with a catless downpipe is a perfect pair.
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2012 bmw 335i sedan
VRSF catless DP
VRSF 5? HD IC
Stock intake(had open before and was sick of noise)
BMS CP
550i 351m rims with 275/245 set up.
No tune as of yet.
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