I've run a TA-04 TRF for 5 seasons now and have placed in the top two in all of them. I have bought a 415, but in know way am I giving up the TA-04, it's a great car, the 415 is for mod class. The TA-04 is going to go back into stock class. I must say I have only replaced wheels and tyres and the odd belt, all good.