Insuring modified car

CCIM
CCIM Forum Participant Posts: 1
edited February 2012 in Towcars & Towing #1

I am considering modifying my Passat to make it a bit more agreeable as a towcar - a simple power upgrade from 130BHP to 170BHP and stiffer progressive springs on the rear. 

My current insurance company want to up the premium by 50% if I do this - has anyone found a more sympathetic insurer?