I've been thinking about buying a DTUK CRD3+/CRD-t box for my 184FR, so I thought I'd have a chat with Aviva first to see how much I'd get stung. After a long webchat, they asked if it would increase the performance, I said yes, from 184 to 240. Even though 240 is unlikely, I had to quote that figure. They said they wouldn't insure me if I fitted one of these boxes. Is anyone with Aviva and successfully declared a DTUK tuning box? If so, how much did your premium go up by?