If it is of any positive help, I can report that many GTV TB-s are being run with original IC set ups on track day events without any problems due to hot charge air. If you are not doing any major tuning then the original one is fine 99,99% of the time.
I ran mine for on whole season of track events with standard IC without any problems.
The biggest constrain for the turbo is the first bit of the downpipe, a moulded piece that has a two "dents" in it, see pictures. After this the pre cat under the oil pan is a big "efficiency thief".
What I have learned from my experience, this is how I would do it if I did it again.
a- make a bigger bore primary pipe and remove the pre cat.
b- use single flexpipe and better flowing cat.
c- after the cat converter, build a straight exhaust system all the way to the rear subframe and then just a 30deg bend towards the standard tailpipe position. Only two, small, free flow dampers. One unde the rear seats and one at the end.
2- Chip ( Squadra Tuning without any doubt)
3- Upgraded turbo
4- Air filter
5- Better IC
As you can see the picture of the stadard IC, there are two ducts leading ambient air through it from the front of the car. These ducts are conical, that is the area closest to the IC is bigger than the area the air is comming in, this helps creating som vaccum to ease air flow for cooling the metalic cores. I agree that the standard IC makes the air turn around 180degrees, but a front mount one will give longer pipes and longer turbo lag time. Allways pros and cons.....