There are many things one can do to a BMW 328is to give it better performance and better sound, and my favorite is installing a performance catback exhaust. The exhaust on your car is usually broken down to three sections; header/exhaust manifold, mid-section (where the catalytic converters and resonators usually are), and axle back (where the muffler usually is). The most common and easiest to change from stock is the catback, comprised of a midpipe and axle-back.
Before purchasing anything, determine the sound and/or performance you want. Watching videos to hear different sounds, finding people near you that have a similar car and have upgraded their exhaust will give you an idea of what you want.
Procedure
Crawl underneath the car and find the connection point on the pipe, usually it is just before the rear differential. Remove the two bolts securing the exhaust in this location. If they are covered in rust, soaking the joint in penetrating lubricant is a wise step to take before removing the bolts.
Once the bolts are removed, disconnect any rubber hangers from the remaining exhaust components. Spray WD-40 or your favorite penetrating lubricant on the rubber hangers before trying to remove, this will allow the exhaust to slide out of the hangers much easier. Once the last one is free the exhaust will come down.
To put the new one on you may need a second set of hands, but you can do it on your own. You will want to make sure the gaskets are in place and start by aligning the end towards the front of the car into the mid-section of the pipe. Raise the exhaust so it is level and get two bolts fed through (one on each pipe) then work on getting the exhaust into the hangers.
Now that you have the hangers connected, finish putting the bolts back on and torque accordingly. While the car is on the stands, start it to listen for any exhaust leaks. If all is well, lower the car and enjoy your better sounding and better performing car all with BMW parts from FCP Euro.
