i am glad that A-plan go by bhp increases not torque, as with a whole host of parts changed in the engine i am only looking at around 160-170bhp. all for £555 a year with it parked on the road (in the city) and average mileage.
When i renewed this year i informed them of: the atb, the turbo, injectors and intercooler with a like for like replacement of all of then and the increase was only £35 from the renewal
my previous insurers (Directline) had a heart attack when i told them of air filter and exhuast upgrade, either triple the cost of my insurance and excess or swap insurer - not a tough choice lol