Originally Posted by chase0830

I aws curious what is involved as far as adding a quad exhaust system to my '08 550. I was going to simply add an RPI and be done with it but really love the M5 look. Obviously, I know the bumper would have to be changed but wanted to know if it is plug and play as far as fit? Also, is the exhaust direct fit or is there alot of modification and other parts needed to install it? I know RPI makes an M5 exaust but I doubt it bolts directly on to a 550. Any help or direction would be great, Thanks. By the way, just did my first mod(matte black kidney grills) and am waiting to receive my red RPI scoop...I see this car is going to start a whole new addiction!

Originally Posted by TheRacerBoss

Get the Umnitza Quad if you want to save yourself a bunch of trouble and pain trying to get a setup done.

If your into this stuff then there are many threads with custom magnaflows done on the 5series where the resonator is replaced with a 2 in 2 out Magnaflow muffler.

Originally Posted by umnitza

Thanks!!!

The E60 Quad exhaust we carry will fit every E60 except the M5 and offers you the lowest entry point price wise for a pre-fabbed exhaust - $599.