Theres more than one reason i have strait thru pipes #1 the sound is awsome #2 people can easily hear me coming, if a car pulls out an knocks me off id like to see him try an say to the police (I didnt know he was there) #3 (restriction) most bikes imported into the uk are restricted by way of the silencers #3 she idles better, she will tick at 500rpm pull off with no throttle and creep past traffic on idle #4 faster more responsive, With the stock pipes 70mph was the limit over 1/4 mile now she will pull over a ton on a 1/4 mile, and as for noise if ppl dont like the noise they can go f**k them selfs, I never ride late at night just in the day time and ppl still complain and that really pisses me off cause i dont see complaints about the boy racers with there 1000w stereo systems and cherry bomb exhasts racing around at 1am, but on the other hand most people like it, they smile wen they hear me coming and smile when they see the classic honda making all the noise. And theres a lot of talk of re-jeting. Theres no need if you keep the stock air filter, i cant understand why poeple think changing the exhast will change the fuel/air mixture it dont the carbs and filters controll that. less back pressure = less restriction on the air coming out of the motor thus making it rev faster. If you increase the airflow into the motor then you need to increase the fuel going in as well (re-jetting).