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Old 04-17-2002, 02:45 PM
Ron Stygar's Avatar
Ron Stygar Ron Stygar is offline
19,585 Miles
Location: CT
 
Join Date: Mar 2002
Posts: 11,141
Mein Auto: Z4 M Coupe 6LL93033
RE: SuperSprint install

There is a front and rear mount on each muffler. There is a rubber band mount which allows back and forth motion. The mount that holds this band is adjustable up and down. The connection to the cars middle pipe is rotating flanges with a metal donut like gasket. The trick is to adjust the two muffler mounts on each muffler to your liking with the flanges disconnected and the band mount floating. Once these are adjusted raising the band mount lowers the tips. If you adjust this with the system connected to the middle pipe, raising the band mount moves everything up. Raising the band mount also gives you more ground clearance. Position the flanges with the flat horizontal for max clearance as well. On my car from the floor to the bottom of the flange measures 5 1/4 inch.
I started by locking in the rear muffler mount on each muffler. This is the pipe that looks high on most installs so you are locking this in at its lowest point without any washers to lower it more. On the drivers side I was able to get the pipes level with clearance with plenty of adjustment either way up or down at the muffler mounts. On the passenger side the front muffler mount comes out with adjustment either way. The rear muffler mount ends up at its lowest point. To get this bracket so it has adjustment either way, I had my machinist weld on to the top end a .4 inch piece of stainless and mill out the slot. It came out really nice. I had purchased a 6 foot piece of stainless to make the brackets from scratch.



Once installed the mufflers do not move to the side as they heat up. They do move down though. Keep this in mind when adjusting yours.
On my '01 M coupe the inner tip on the drivers side sticks out about 1/16 inch more than the passenger side.
When I removed the exhaust for the differential install, I undid just the bottom rear muffler mounts. Left the top ones (which adjusts the up and down) as is. Once I had the exhaust out, I noticed scuffs on both exhaust pipes directly in line with the rear cross member (axle support).



Based on the scuffs, when I reinstalled the exhaust Monday evening I raised the center mounts full up and locked them in place. The drivers side came out the same. The passenger side was lower about 1/4 inch. Tips stayed level on each side. This tells me that the center mount on the drivers side was initially all the way up and the passenger side was not. To raise the passenger side back up to where it used to be, I will undo both pipes from the center pipes. I will then raise the muffler up using the top muffler adjustment points. To get it right, you may have to go back and forth a couple of times. Once set up, it will stay if you leave the center mounts in a known place (like all the way up) and just disconnect the mufflers at the lower section of the mounts.

Last edited by Ron Stygar; 04-17-2002 at 02:49 PM.
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