my favorite upgrade visualy has been side skirting. Makes the car look 100% better. Here's a nice pic of some side skirting at work from one of the site sponsors
my favorite upgrade driver's perspective, have been the GT3 seats. I feel like I'm in racing car not just a sportscar. But 99% of the world would hate getting out these seats. Just a weekend driver for me.
My most disapointing upgrade have been Litronics(HID). Not worth the cash.
The car investment I get the most comfort from it the Valentine One.
And the Carrera 5 spokes are one upgrade I never tire at admiring.