Hi I finally have my quad tips installed with m5tech rear. Magnaflow center muffler 11385, 2 additional twister tube resonators nxt to center muffler, 2 ultra quiet vibrant resonators 1140, and nameless 3.5 staggered tips. It is loud when cruising and between 1800 to 2300 rpm. Not sure what else to add or change on my set up.

 

nice..
how did u manage to go on the passenger side...???
they all say there is no room because of the baterry housing !!

 

You have about six inches clearance on the passenger side. The resonators are about five inches wide.

 

The resonator seems to be very close to the gas tank. In case if it can evaporate your gas and turn your car's MPG to the M5's, put as much heat shield as you can if I were you.

Post more pictures with the car on the ground!

 

With all these parts installed, Im still getting loud cabin noise when cruising between 1800 to 2300 rpm. For those who have done quad conversion on their 530i, any suggestions and recommendation is appreciated. Thanks