I did as much searching as I could and it appears that the Greddy kit is designed for a s5 while HKS has one for the s4. Is there much difference in fit between these and what cutting is required with either?
Also, where can you get the HKS kit, do they still make them?
I'm putting a GT35/40R turbo in and also need to find a T3 exhaust manifold or a way to hook up to a t4 manifold with a t3 flange or maybe a cheap trade+cash for a t4 housing.