What rear end gears for 904?

YR beat me to it, but post number four indeed. To me, really low gears start at 4.56...But the low gear set (and I highly recommend a clutch pack upgrade) in the transmission is definitely a plus for the shot of nitrous. I would be looking at a999 upgrades and a converter (preferably custom) with anti-ballooning plates before worrying about gears. Everyone I know that starts running nitrous gets the boost bug and starts adding more heat to the chili eventually.