I have a TA04R and my friend has a 04Pro. I think they are VERY fast cars. i like the 04pro hopped up better than my XXX-S much more. It is also very durable and can take a lot of punishment. His upgrades to his car are: Carbon upper/lower deck, f/r shock towers. Ti screws, X-ray battery holding system. mid oneway and some other small stuff. I just love the car.