First one was too restrictive for a 2.4 which flows a lot more gas than a 2 litre, but worked well on a 2.0.
Second one is currently on my car which has larger diameter primaries
Modifications were wastegate related primarily as Saito put the pipe in the wrong place so you have to get it moved. Also made some changes as they didn't do the twin-scroll properly but you wouldn't need to worry about that as that is because I wanted it to support a twin-scroll turbine housing if/when I have one.
John