im getting exhaust cut outs on my 03 audi a4 and i need to know what size the stock exhaust is

 

i believe its 2"..i did mines 2 1/4" from cat back but thinking of doin 2 1/2" idk

 

Do the 3.0 have same exhaust as other motor?

 

hmm idk

 

ok thankss

 

what kind of power gains did you see from the 2.25" exhaust?

 

well i did new cats on my car they were 2.25".. after i did cat back 2.25" n toke the third dead resonator out it was i felt more power on my car also more gas n it was a little too loud for me so i resonator back n kept 2.25" cat to resonator its got a little aggressive sound to it but just not enough i hear lots off people tell me do 3" cat back but idk ill probably go wit 2.5"