For the price of it, you'd assume it'd be rubbish, but it's all the possibl "hop-ups" 3racing could think of for the old F103. You definitely want one of these
http://os.3racing.hk/products.php?products_key=2737 and I think there's one or two other things, but I can't think of them right now. The kit tyres are actually quite good though