Yes, HY35. Keep in mind you're squeezing all that exhaust through a 9 cm^2 exhaust housing before you get to the elbow. 9 cm^2. That is equivalent to a 1. 3 inch diameter pipe, will it make much diffrence to step up from 3. 5 to 4 inch? Probably not. The slightly larger compressor wheel in the 04. 5 turbo will help more than anything but if I were going through the effort I'd just buy a bigger turbo. My $. 02
-Scott