touch wood i haven't done a belt in a year with the cat either. probably depends a lot on the track you race at and any dirt getting in around the gears and wearing on the belt.
As for car improvements, the main ones are covered by third party bits such as the stegger brace to beef up the front end, and the atomic carbon lipo retainer for cells without humps.
I wish the fat springs were different colours like the old ones, as the writing on the ends will wear off pretty quick! Not a huge fan of the blob of nail polish approach!
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