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Discussion Starter · #1 ·
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
 

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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..
 

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

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