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I went with the HJS 300 cel catted downpipe from Mike @ x-ph for this very reason, I did not want to mess with spacers, CELs, failed emissions, etc. Paired with the MHD stage 2 tune, AP intake and DINAN mid-pipe, my 440i is now a transformed car and way more fun to drive and sounds amazing, even with the stock muffler.
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2018 440i Gran Coupe (F36), Glacier Silver/Black Dakota, M Performance and Track Handling Package, MHD Stage 2 and xHP Stage 3 flash tunes, Dinan Shockware and mid-pipe, HJS high-flow cat, AP Intake, RW Carbon duck bill spoiler and rear diffuser
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