the stealth will be way quiet. If you want a deep sound. i really like the mbrp if you can find one and also i heard the f2 one the other day and it sounded deep with out a header. the fs race one would be louder since there is no resonator. I have heard the fs stealth in real life and it was just like a stock exhaust. it seemed quiet much quiet than the way the st sounds stock. (i think)
what are you wanting to get out of your car?