this weekend i had a shop cut out the muffler in the back and the resonator in the front of my ses. I left in the pre muffler that sits just in front of the back tire. It sounds great! Alough because i stuck with the 2" pipe it does sound a little ricey when i floor it.
FYI open manifold sounds amazing at idle but you may wanna invest in some ear plugs if you go that route. also you lose all your bottom end torche and hp.
I dont often race... but when i do its in a Focus.