Hello @Frank ( Sunnyside ) ,

As to your questions,
The intercooler part numbers are the same from 2003, all the way to 2018 for the intercoolers, those being 3W0 145 803 E and 804 E, these part numbers are listed for the base GT, the GTC, the GT Speed, the GT Supersports, and even the Flying Spur, the only difference in part numbers is the 3W0 145 803 G and the 804 G that comes up for the 2017 to 2018 GTC and the GT Supersports, when searching by the part numbers instead of the vehicle model and year, the "G" version of the intercoolers to me has nothing to do with their size, and only to do with the parts included in the part numbers, where the "E" version is just the intercoolers themselves, the "G" version adds bolts, grommets, sensors, etc.

As to the Supersports bonnet vents, yes, they are functional, you will also cut 3 holes on each side on the underside of the bottom as pictured below.

Please share your tune information, if you don't mind.

Johnny

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Found online for measurements.

 

This is the graph of the tune Celtic tunings map offers
Thanks for you excellent reply Johnny.
I think Superlative motorsport do up rated Intercoolers.
As to bonnet vents any ideas of any good suppliers. I havent priced them st Bentley yet.
BTW that grthh is supposed to show 742 bhp and 738 ft/lbs ota.
The tune details are on Celtics website.
Frank.