I noticed my muffler has a 2 1/2 inch clamp securing the 3 inch pipe that comes from the cat. Do I have the right muffler inlet size ? Did someone squeeze down the diameter of my pipe to fit into the muffler inlet pipe ? Sould I have 3 inch clamps at the muffler ? Is it normal for the 3 inch pipe to come down to 2 1/2 inches at the ends ?

Thanks

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88 GTA 5.7 TPI Charcoal Grey Bone Stock except for loose muffler which makes it a bit louder than normal.

 

Sam thing here, the cat outlet pipe is 3-inch comes out into dual 2 1/2 inch pies from the muffler. Seems normal to me, you would be able to see if somebody tried to squeeze the pipe on.

 

Mine is like that, too. I had MAF relay problems and a backfire blew out my GM muffler. Had to get a Blowmaster (cheapest). Seemed odd to neck the pipe down like that...

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88 IROC with cobbled together (not by me)drivetrain, 86 (?) TPI unit,CE subframe connectors, Edelbrock strut tower brace, polygraphite bushings all around...it handles like a dream, but man is it hard to push!!

 

Bjase,


Were both mufflers necked down at the inlet ?

GTA88



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88 GTA 5.7 TPI Charcoal Grey Bone Stock except for loose muffler which makes it a bit louder than normal.

 

maksik7,

Yeah, but on mine the 3 inch pipe from the cat is tapered down to 2 1/2 inches when it clamps onto the muffler inlet. What is the inlet diameter on your muffler ?

GTA88




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88 GTA 5.7 TPI Charcoal Grey Bone Stock except for loose muffler which makes it a bit louder than normal.