Colinizballin
Respected
Hi, first post here. I just bought a 2006 Civic Si and I love it. The car came with upgraded headers a straight exhaust system and removed catalytic converter with a 2-2.5 inch muffler tip. (not sure what any of the brands are right now or muffler type) car is at decent noise level until past 4k RPM where it just gets ridiculous. I like the feel of the upgrades on the car and they are well done, but I am really looking to cut back the sound level. What suggestions would you guys have to permanently reduce the noise so I don't get pulled over or seem overly obnoxious. (ie putting catalytic converter back on) Thanks.