I have a set of 2.5" Flowmasters with dumps on my donor car. I was thinking about swapping them over but I'm concerned about exhaust fumes. I drive the car 50 miles round trip everyday to work. I'm concerned about exhaust fumes getting into the car. Local exhaust shop that did my last exhaust won't do dumps on a street legal car due to fumes. Should I just order a set of 2.5" tail pipes?