Just a quick question. What is the diamter of the pipe? is it 2.5"? 3"? or wat.

Your taling the inside pipe where it connects to the mid pipe? I have a stockie packed up in the basement if you havent found the answer yet.

2 probably. Just guessing but why would u upgrade to a 2.5 or 3'' if thats what it is already.

i mean the part which attaches to the exhaust pipe. where there is a flange of 3 holes where the studs go thru, and u put on 3 nuts to hold it in place.

Supersprynt i dont understand ur question. if ur referring to why do ppl get aftermarket downpipes? well if that is the case, its because some aftermarket dp's look better, give u more hp because there is more flow, some prevent boost creep a lil, and bigger dp's prevent back pressure from the turbo

i beleive its 2.5

sweet! thx bud

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Also, the stock 3s DP has a cat in it.

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It was rhetorical, not meant to be answered.