Well I picked up some N55 mids the other day. I'm currently running N54 mids with the y-pipe and BMWP exhaust. I intend to install the N55 mids without the y-pipe, but leave the BMWP rear section still on the car.
Do you think the car will be quieter or louder this way? Place your bets now - I should hopefully have the answer tomorrow if all goes well.
Essentially, I'll be adding back in a resonator (by not using the y-pipe) but removing the secondary cats. I'm not sure what suppresses the most noise though, the resonator or the cats?
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