Am not aware I've done wrong. My post is in GG and is a comment based on my experience of running a car on the road for a short period with open exhausts.
Aha, my mistake. Combination of tiredness, touchscreen, and tablet. Am still a bit stone-age re using symbols and ITech in general. Deserve a clown symbol myself for that one:-)
Thanks for pointing out my mostook. Mistake. Am off to bed, have to meet customer at 10am. Thx..