My son has side pipes on his 80 something amc concord,Now don't get mad,It had a chevy 400 in it.Well the local police stopped him and said they are illegal, as the exhaust could heat the rear tires and cause a blowout.We haven't changed them and haven't had any more trouble with the cops.The rest of the exhaust is legal,flow through cat's and good sounding mufflers so they can't ticket em for that.