I'm thinking about getting an Apexi N1 Universal Non-turbo muffler installed. I want something that's loud but has a good tone. Right now I have a Magnaflow oval muffler that's pretty quiet but the sound is good; it's a little raspy since I took the resonator out. If I get the Apexi, should I just install the muffler or should I change all the piping to 2.25". Will it be considerably louder than the setup that I have now? BTW, my car is a 4 cyl.