Malcolm, I noticed that the RX4 has a radial brake caliper and an improved radiator fill. The cooling looked reasonable and more accessible than the RX3. As for the exhaust, having it low keeps it from burning your clothing (that has already happened to me) but does expose it to rock damage. I'm OK with that routing. Since the RX4 is still 'under development' it's too early to cast judgement. I'm very interested in this product and when CSC brings it to the US I think it will be a real hit.
Peter Y.
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