so today after work i was just entering the freeway and i had to speed up, the car was stil abit cold cos i had just gotten out of the car park. and the lane was ending and i had to merge to do a uturn. anyway i stepped on it hard and all i herd was a really loud whistle noise, usually my car doesnt whistle this loud. just wondering what it could be? and ideas? btw just the day before i put my stock exhaust back on ( cos i got an epa letter apparently its too loud) so anyway could this have some thing to do with it?
please help and thank you