As has been said, underground car parks are the best (worst?)
Side pipes are best as the pressure pulse is aimed directly at the cars along side you. Many car alarms are pressure change sensitive.....
The only 'design flaw' with an Aero is that the side pipes direct much of the pressure wave underneath the adjacent cars. What you need is a V8 LR Defender on side pipes. The height is perfect... Allegedly
Stuart "There's no skill substitute like cubic inches."