you wont find, this is a blow through, you need to fab one up before the throttle, it also requires tunning, as soon aas i got it i got it tuned bye tom.
if you are getting it welded then you can really go with any size.....just make sure it is the same type of material as the IC piping or else it wont work......unless roush had a pipe that works with flange i think u will have to weld.....but if you have like 2-2.5 inch IC piping...go with lik a 40-45 mm greddy flange.......hope i helped
well the roush kits blow-off valve recirculates the the air. if your gonna change the setup then im guessing you will have a problem w/ blowing off metered air. this is just a guess.
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