NRG is the biggest piece of shit ever. Please do not go there if you value your car. The only reason they have the dyno is because they screwed over the other shop they were partnered up with, so they took their dyno and got the fuck out of dodge. Everyone in their whole section of the industrial plaza that they are located in will tell you how shady they are. I can tell you some stories of how they beat the shit out of the cars they "work" on and take them out joyriding and shit. I've seen all this happen first hand.