yea i basically have a hubrid drag kit........my question is how big should the IC pipes be to support around 400-450whp........my pipes are i beleive to be 2 1/2??? the charge pipe from the turbo to the IC tapers a pinch but it's 2 1/2 in and out of the IC and i'm just wondering if i shoudl upgrade these pipes to support my desired horsepower numbers?? thanks

 

2.5 is more than enough for that power. I've seen over 600whp on 2.5", I think you'll be alright.