Hi thought it would be worth while posting my experiences with upgrading my 400. I desperately wanted to be able to use the car on track without the noise worries we all suffer with so is been in contact with Dave Hackett at Hangar111 reguarding his development of the quiet system.  We got the car booked in and also fitted the komotec 460bhp kit at the same time.    The work took 2 days ans diving home tge car felt immediately stronger throughout the rev range, but it had los