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2004 gmc
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Discussion Starter #1
Hi. I am building my own exhaust soon and i need some help. I know the piping is 2.60~2.75 depending on ID or OD, but what is the Diameter (ID and or OD) of down pipe? :undecided

Im putting a new higflow 3 inch in/out cat to a 3 inch In FLowmaster Super40 dual 2.5 outs im taking straight to the back. I just wasn't sure what the down pipe size was.



ANY ADDITIONAL SUGGESTIONS ARE MORE THAN APPRECIATED THANKS!!!
~mike
 
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