minimac
minimac Dork
8/16/08 6:47 a.m.

I'm cobbling up a custom exhaust for my old BMW, but hit a snag. I need to find an inexpensive(cheap) muffler, with two inlets/outlets-that's NOT a glasspack or such- or an adapter that will allow me to go from my twin 1 5/8" pipes to maybe a 2 1/2" single. Right now I've got the cat, twin pipes to a small resonator, and twin pipes to the muffler, which was shot. It's a bit too loud without a muffler to run straight pipes. There is plenty of room-the stock muffler was a huge twin in/out affair- so I can fit just about anything. I know I've seen the adapters somewhere, but couldn't find them. Anyone know of a source? thanks..............

stuart in mn
stuart in mn Dork
8/16/08 9:28 a.m.

You didn't mention what kind of BMW, but I assume like most older ones it originally had one muffler in the middle of the car and a second one at the rear. I ran my '86 M535i for many years with two genuine Cherry Bomb glasspacks :) in place of the rear muffler - they were mounted side by side, and held together with a couple metal straps welded in place. You said you didn't want to use glasspacks, but they actually sounded pretty good on my car - not very loud at all unless I really stepped on it, and really pretty quiet at cruising speed.

minimac
minimac Dork
8/16/08 8:54 p.m.

update** I ended up at the local muffler shop and bought an adapter. This one was two 1 7/8" into a 2 1/4". The crook got me for twenty five bucks. I talked to the kid on the counter at Advance Zone, explained what I wanted, and he came back with a nice round single in/out muffler that was a little shorter than what I had. With a couple of clamps and a connector, the tab came to $34! Piped it all up and it sounds as quiet as new! It even ends right below the bumper and looks like it was made for the car. If it was the old 325, I would have left it with just the cat and the resonator with straight pipes running out to the back, but being the 733 I figured it would be better being quiet.

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