It's not doing it, sorry. Mine will chirp third with a perfect shift, full tank of gas, and stock suspension. Of course Im on all season tires with an A traction rating (560 treadwear).

Back on topic... a flowmaster might have a decent sound, but it's going to hurt your top end performance. You might help your bottom end a little but it's adding too much back pressure to do much. Those things flow like crap... why do you think all of the cars have hollow mufflers?