Originally Posted by Howitzer

And you'll also lose about 10 ft/lbs of torque and 10 horsepower as well. You don't want to run straight pipes on a car because there is zero backpressure so you'll really be losing power. Plus, it will sound obnoxiously loud and farty.


Here is what I would do:

1) Buy an RPI exhaust for the 530i and purchase an extra set of tips from them. Install the RPI exhaust and on the right side install the tips with a dummy backplate or short pipe leading back a bit and tack weld it in place (or with a hanger, whatever). Only problem with that is in cold weather it will be obvious that you're only getting exhaust from one side. Then you still use 1 muffler and lose no power, just gain power!


2) Another option is removing the resonator and installing the RPI exhaust there. Then run a Y pipe to the back with 4 tips of your choice (or buy another set from RPI).