I just bought a 1998 C1500 extended cab 5.7 and was wondering what size exhaust it has? I see there is 2 catalatic converters then 2 pipes going to muffler then one bigger one going to the tailpipe. I want to change out muffler to a magnaflow. Anything would help thanks!

 

i believe it should be 2 1/2 like mine was

 

I have the same exaust my solution was to cut out the old muffler and install true dual exaust with 2 separate mufflers 3 inch inlet 2.5 out mainly for performance reasons and back pressure being someone removed the catalytic converters but if I had the cats I would have just gone 3 inch in and out hope this helps

 

Exhausts have to be specially engineered or designed by a specialist who does exhausts.

If you get the wrong wrong one your valves will pull wrong you'll damage your engine.

USE OEM or at least "exact replacements" only.

I worked at a dealership and whenever a motor with THROWN RODS CRACKED BLOCK or serious engine problems came in, often with a crying customer: it was someone who toyed around with the "exhaust"

 

> Anything would help thanks!

anything won't help. you need the right part or to have someone that specializes in "custom car pipes" to design it for you

 

Made an account just to tell you that you sound like a complete tool. Exhaust valves don’t “pull”, and they will function regardless of exhaust piping diameter. Whether the job they’re doing is still being done with efficiency is another story. Stop misinforming people and trying to sound smart.

 

I had to make an account also just to let you know this is complete BS. Dude... You really should refrain from commenting on things you know nothing about. This is all nonsense and lies. You did succeed at exposing yourself as an idiot. Don't know why people want to spread false information but here it is.