Yeah. Sell both your cars, and get a 511, but thats only if you can find one. New TRF511 kits are close to impossible to find now, so you'll probably have better luck looking for a used 511, but thats ok as long as nothing expensive is broken on the car. Make sure the chassis, towers, bulkheads, turnbuckles, and diffs are all ok, and then usually you'll get a bunch of spares with the chassis included as a bonus. Thats what I would do, otherwise, sell the 501x, and buy a DB02 when it comes out. Thats what I would do.
