Exhaust -- Mufflers, Headers

650skull · Support Staff Joined: Jul 19, 2007 Posts: 1186

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650skull · Support Staff Joined: Jul 19, 2007 Posts: 1186

Pamcopete; Well, I found the best way to match an aftermarket muffler to the double walled headers is with the use of an adapter:

Part number 548520, available at most auto supply stores. It's a 1 1/2 inside diameter to 1 3/8 outside diameter.

I used it to install my mufflers on my '81/H stock double walled pipes.

It looks like the muffler is clamped to the outer header pipe, but not so. It is just butted up against the outer pipe.
The smaller diameter of the adapter fits over the inner pipe. The muffler fits over the larger diameter. It's such a tight fit on the inner pipe that I didn't have to use any sealant, but if you want to, you can use a muffler sealant.

I think a lot of people just clamp the muffler over the outer pipe which is not designed for any pressure and in fact leaks at the header flange and has two drain holes.

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