MAGNAFLOW 12589 or any other 3" muffler to 2-3/4" pipe question
 

Sparing a lot of the details, I have a stock, replacement catback bolted to my Ebay headers, and I decided to put a Magnaflow 12589 muffler on yesterday.....I have a lift, and air tools, oh...and an empty acetylene bottle....easy, right?

Well, no, LOL... :hack:

My favorite air chisel bit snapped before I got either end of the existing muffler cut loose from the pipes, so hammer and chisel by hand, woohoo...

Get the old whisper quiet AP brand 100# muffler off and sit the Magnaflow up to see where I'm at.....I see that I'm at UpTheCreeksville....:bang:

I didn't realize/remember, the stock pipes, and stock replacement pipes are that insane, oddball 2-3/4" size, and this Magnaflow is 3"....oops. :think:

Anyway....

For you guys who have used this, or any other 3" muffler on your 2-3/4" pipes....did you use some sort of "adapter", "spacer", "reducer", or just weld it in, or have it welded in?

I'm trying/hoping NOT to weld it in if possible, but if that's the best solution, then I'll have to just weld it in....

I found this:
http://www.summitracing.com/parts/wlk-41975/overview/

But it may be too long since the muffler is same length as stocker...

You need something like this:

Dynatech 789-70275 Stepped Band Tube Clamp, 2-3/4 Inch - Speedway Motors, America's Oldest Speed Shop

Thanks. That's worth a shot if I can find one local. I have a 3" one on there now, which obviously won't get tight enough on the 2-3/4" pipe.

My 99 actually had 2 7/8 od pipe and I put a piece of 3" pipe over the factory pipe then the 3" muffler over that. The 3inch will have about a 1/16 gap in between it and the 2 7/8 od pipe so I welded the connection.

Mine had 27/8" just expanded the pipe slightly and welded up.

Hmmm. That's weird...Maybe because mine is an aftermarket, stock replacement, it is/was 2.75"? In fact, I'd swear the front pipe's O.D. is less than 2.75"...

I may just suck it up and buy a Dynomax front pipe for $100 and be done with it. My luck has always been that whatever was welded, is always the first place to rust away. :cry:

Easiest most secure way is to pie cut the bigger pipe lengthwise in about 1 inch cuts going around the perimeter then hammer it down to close in on the smaller pipe then seal it up with a mig welder. Super easy.