my last Z was almost stage 3... it still had stock exhaust, but had gutted precats and main cats as well as an upgraded clutch and JUN flywheel... so it evened out. One night at the street races in Dallas I tore up a whole lot of cars... a modified 93+ RX7, a BPU Supra TT, a modified 97+ VR4, a C5 corvette, several modified LS1 Camaro SS's and ram-air TransAM's, an NSX, but the best victory of the night was a 97 Porsche 911 Turbo. I pulled about 1 car length on the highway from about 60 up to 130. Damn that was a fun night. Only car I lost to was some old 60's Z28 with slicks and nitrous.