It seems like it becomes a free for all when it comes to modifications to a car and depending what mood the underwriters are in that day as i was with esure for 8 years but they wouldn't even quote me with mods
My mate with the auto version of your car has just fitted the BMW Akrapovic exhaust and will be selling it when he changes the car next year, i will let you know when he does if you're interested
Sounds amazing!!
I've got the Stillen bumper fitted to my supercharged 370 and it has definitely improved airflow with the huge opening and intake above the number plate
No issues with cooling so far