Nick -
If you look at Simon's (Simonrjw) Aero (that he bought from Viper),he has the air vent grilles in the front
'bumper',a la GTN.
I'm not sure if they are connected to any tubing - but I've always thought they looked good
I had planned to do something similar (and use the nacelles for DRL's) but I chickened out cutting the holes....

James
Hi James,
I do recall seeing them on Vipers old car, I to have always been fond of them however I would want them cutting very accurately and don't think I could bring myself to do it!
I also want to take a look at how they are on the GTN, incase the metal is furled back rather than straight cut - to make sure its done properly!
I can imagine us both sat there with the grinder.. you first, no you first.. and so on
Nick