I own a 96 integra rs I know not a vtec sad to say but my civic hatch on the other hand... b18c. Ive always wanted one new to these kinds of cars but always wanted one. Im a novice when it comes to tuned cars and all that good stuff. Well this thing is loud as fk and shoots about a 3 foot flame when shifting out of vtec. Now don't get me wrong I really enjoy it! Now being in Oregon for work they don't! Now the real question is can I do some nice race headers with a high flow cat and muffler? Or would I have to have it re tuned? I've also had a stright pipe and it's even louder then the 1320 hood exit lol. Any help would be much appreciated! Thank you for your time and allowing me to be here!