shish

Hi all, I'm a new scoob owner (had mine now for a couple of months) and I'm loving it. However, the time is coming up for me to re-new my insurance and I want to shop around. I've got a 2002 WRX and it has a pro drive WR Sport back box fitted. Now I know some exhaust systems can affect the power produced by the car (especially if you remove the CAT, etc...) and so far I have insured the car with 'up to 10% power increase from stock' which I'm pretty sure the back box won't exceed. However, looking around, some insurers are asking for an exact bhp value which I'm not quite sure what it is.... Does anybody have any suggestions for the best thing to quote?

Also, apologies if people think this would be better under the insurance section of the forum's, but I thought it better placed with the other exhaust related articles.

Cheers for any help in advance

Andy J.