Got the letter in this week as well to renew on the RB and threw it in the bin after studying it. I couldn't make up my mind if the shocks would be covered as i've already had them done under warranty to the "upgraded" versions. As for modifications, the way I read it, and I could be wrong, but even putting on an aftermarket exhaust would invalidate the warranty -so the exhast goes and you must fit the original exhaust at over £1K - **** that, i'll put on an aftermarket one for half that and it will look and sound better. I will probably join the AA though, and probably before the Highland Fling!!!
Will keep the tracker as is - seems good value for 100 euro's and is working fine (as i find out every time i set it off by accident!)