I have a 2000 civic si with a jrsc. I want to improve flow for obvious reasons, but i don't want a loud exhaust. The apexi WS and the Thermal stealth are both quiet, but does anyone knkow f they actually improve flow? would it be worth getting either, and if so, which do you reccomend. Thanks

thermal 3" turbo system with the stealth mod and maybe add on a resonator