if i park in an underground car park, ecu underground today for example, i start up my car, and within 5 seconds car alarms start going off, and as i drive to the end of the row to exit, more go off? but it only happens on some days... my exhaust isnt overly loud, on my permit (the same one i got for my stock bonnet scoop and wing) it states exhaust as "not noisy at time of inspection"

who else has the same trouble?