The cops here take a measuring tape and stick it in your exhaust pipe and measure how far it goes in before it hits a baffle.If it doesn't hit a baffle within a set amount(I can't remember),voila,a ticket is born for improper muffler.So you might want to steer clear of "straight through" design mufflers.I agree with going with the Flowmaster,even though it's "muscle car" equipment because they have baffles.If it's got baffles,less hassles!!!!