Be careful with the insurers. Anything they deem to be of engine modification can dramatically increase your premium or worse - void your policy altogether.
The knack is to find a firm that has open ears and listens to what you say regarding the work being done. Basic phone operators who simply click boxes on a PC screen at the other end of the phone will be useless.
Like I posted sometime ago, my Punto GT insurance went from £750 p.a up to £2,000+ - because I admitted to having an induction kit fitted. The performance gain and actual IK component itself were irrelevant to the insurers. It was the fact that it altered the factory-standard performance (even by a tiny amount) that caused the issue. They didnt bat an eyelid over the exhaust, the 17s, the strut brace or dump valve - because none of these improved the performance of the engine itself....
D.