simple question just what is the differences between a 90' gtu and a 90' gxl

Well you could try the fact that the GXL is the top-of-the-line model and the GTU, you know, isn't...

gxl has the auto adjusting suspension, power winders, rear wiper, sunroof (gtu might too, but nobody cares), the seats with the seperate headreast, sushi bar, a picallo, the 'gxl' stickers....



options on the gxl are leather, cd player, and 2+2 seats.



notice neither one has anything cool like a turbo, or a limited slip diff, or light weight

what can i swap from a gtu to a gxl for lighter weight or better handling or performance or anything like that. im goin to swap the rear hatch so i wont have a rear wiper and to manual windows for weight savings. also are t2 springs stiffer and what about using convertible springs.

any stock spring sucks due to they being old as sin. If you want better springs buy new or ebay.

its also important to note the s5 GTU, is basicly the "base model" of the s5, and has single piston brakes up front... vs the gxl has the 4 piston ones like the turbo

whats the difference between GTU and GTUs? is there any difference at all? ive never seen a GTUs.

The GTUs is the mother of all S5 NA's... its essentially a turbo II without the turbo

the gtus also had a 4.3 rear end

There is actually nothing turbo about it but the brakes and wheels. Its got an N/A driveline.