[Oh2rado]

i have a 2002 silverado c1500 with the 4.8 and im looking to get a flowmaster super 40 muffler but i dont know what size exhaust i have so if any1 can help it would be great

 

[1996 Yukon]

is it di/so or si/so? if its the second one then probly 2 3/4 but i dont have an nbs i wouldnt know..

 

[Oh2rado]

si/so so should i get 3in. in 3in out or 2.5 in and 2.5 out

 

[1996 Yukon]

just call up whatever exhaust shop youre gonna use and go from there really.

 

[CHVY4LF]

I believe stock pipe is 2.57 so a 3 in 3 out should be good, thats what i have