I'd say that as long as you're happy with it, and doing well, no need to change cars. I would keep an eye on the spares market for it, as if that dry's up and you have a major crash, your car could be on the shelf for quite some time.
I upgraded from the TC4 to the 5, simply because I felt that as a shop, I should be running the latest equipment, and although performance wise, I didn't need to do it, the 5 runs a lot better than the 4 ever did, even if I'm now only getting to match and beat it's race results.
Guessing you're wanting a 2wd though if you change, but have you thought about the Yok BD-Max? It's an amazing looking car, and the story is it was seen as a bit of a joke "cheap-end-of-the-market" car, until it started winning races, and now it's been carbon-ed up.
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