Stock exhaust size

Archaic2021 · Oct 4, 2023

Anyone know the stock exhuast size for a 97 c1500 from cat to muffer. Wanting to cut factory muffler off and bolt a aftermarket one and do a cheap hanger

Nad_Yvalhosert · Oct 4, 2023

What engine?

If it has a V8, and if you've actually been under the truck, you would've seen that there are two ~1.75" head pipes that end at a 3 bolt flange. Then there's an O2 sensor just after the flange that needs to be used. Lastly, you'd have measured the spread of the two inlets to the muffler and found that its gonna be difficult finding anything but a restrictive stock replacement, especially if you're going cheap...

Good luck

Komet · Oct 4, 2023

Buy digital calipers -> know all the sizes of things.

Archaic2021 · Oct 4, 2023

Komet said:
Buy digital calipers -> know all the sizes of things.

I need to

Archaic2021 · Oct 4, 2023

Komet said:
Buy digital calipers -> know all the sizes of things.

Nad_Yvalhosert said:
What engine?

If it has a V8, and if you've actually been under the truck, you would've seen that there are two ~1.75" head pipes that end at a 3 bolt flange. Then there's an O2 sensor just after the flange that needs to be used. Lastly, you'd have measured the spread of the two inlets to the muffler and found that its gonna be difficult finding anything but a restrictive stock replacement, especially if you're going cheap...

Good luck

I have the 5.0 It's single in single out after the cat. It looks to be 2.25 but I wanna confirm.

RichLo · Oct 4, 2023

Cheap way of knowing is wrap a string around the pipe (Circumference) and measure the length of the string then divide by 3.14 and you'll have your Diameter.

Nad_Yvalhosert · Oct 4, 2023

Archaic2021 said:
I have the 5.0 It's single in single out after the cat. It looks to be 2.25 but I wanna confirm.

Single pipe '97 vortec 5.0? Strange...
I'd third the purchase of a digital caliper. GM did some weird pipe sizing. Like 2.75" tail pipe on my Yukon weird

Archaic2021 · Oct 5, 2023

RichLo said:
Cheap way of knowing is wrap a string around the pipe (Circumference) and measure the length of the string then divide by 3.14 and you'll have your Diameter.

I did this and got a litle over 3 inches

Erik the Awful · Oct 5, 2023

Archaic2021 said:
I need to

You can buy a cheap, plastic digital caliper for 95% of things. It's accurate enough to check how deep in the hole your pistons are, but not repeatable enough to set up a diff.
www.amazon.com/Digital-Caliper-Adoric-Calipers-Measuring/dp/B07DFFYCXS/

Then when you get the money you can buy a real caliper.
www.amazon.com/gp/aw/d/B00IG46NL2/

L31MaxExpress · Oct 6, 2023

Nad_Yvalhosert said:
Single pipe '97 vortec 5.0? Strange...
I'd third the purchase of a digital caliper. GM did some weird pipe sizing. Like 2.75" tail pipe on my Yukon weird

The 4.3 and 305 used a single catalytic converter with a Y-pipe.

Stock exhaust size

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