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This might be a dumb question. I just bought a 540i. If I was to upgrade the exhaust do I need to change the diffuser for the quad tips?
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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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