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If I bought the corksport short down pipe what size flange should I get for the racepipe?
The flange is in relation to your exhaust. Aftermarket cat back exhausts will make with the 80mm, OEM takes the smaller version.
If i want to put this racepipe on stock downpipe but i already got cobb catback exhaust what fitment should i chose? (i dont want to change whole downpipe with cobb)
You need the 80mm option
If I purchase this racepipe, which fitment size should I choose if I want to keep the stock downpipe but install a CorkSport catback exhaust?
You need the 80mm version.
Is the stock fitment option still a 3" pipe but with stock flanges? Or is the entire pipe stock size (2.5")?
It is a 80mm pipe and tapers to 2.5 to fit the OEM flange.