Hi - I'm starting to modify my E93 M3 - exhaust, remap. suspension, wheels, trim, brakes, mostly with none OEM equipment how do I stand with my car insurance. Do I disclose all my mods or just those that affect performance,
do some of you not disclose anything (you do not need to answer that last bit!).
What is your experience, does the premium go up a lot, or will I have to change insurers?
Thanks in advance.