Why doesn't IPD do anything about the loud cars peeling out at stop lights?

I hear it several times every single day and it's always cars with modified exhausts. They speed off the line like it's a drag race and it's the type of lowlifes that you don't expect to see in Irvine. IPD isn't enforcing the noice ordinance laws so I expect it to get worse. This city seems to get worse every year.