I have an XR5 with ECU flash, brings the power up nicely. They aren't as easy to get power out of as the XR6T obviously, but the reason I blame mostly is the turbo. It is small. Coming from jap imports, power is much easier to get out of an SR20 or to be fair, they are similar to an RB25. It's the turbo size holding them back, but the benefit of this is, boost comes on VERY early and it hardly feels like a turbo, compared to what I've come out of. Everyone who says FWD is a problem is bang on. It REALLY is. Boost is limited in first and second and it needs to be. After the ECU flash, it's only pushing about 155FWKWs maybe 160, but struggles to get traction with expensive tyres. Having said that, once it's rolling, it's good. Had a little accelerate next to another car also accelerating... boss 260 falcon and I'd say there wasn't a great deal between the two. and at the risk of getting flamed, I felt that, had we broken the law, which we didn't and gone to third gear, I would have started to hit big boost ( thanks to the flash ) and started pulling away. He also would have destroyed me off the mark if he wanted too, but both rolled slow at the start. AWD may have cost more, but it would be well worth it. Just look at 0-100 times of XR5 vs RS vs RS500... as they increase the power, it doesn't matter, they still can't get a good time off the mark because they all battle with traction. ps- I've put my XR5 back to stock tune to see what it was like... the flash makes a HUGE difference, much like it would in any turbo car.