Straight piping your car will make it as loud as it can possibly be. This is achieved by removing all mufflers and resonators past your catalytic converters. we do not delete catalytic converters. it is illegal to the state of california to remove any and all catalytic converters. and to be honest, if you remove the converters, your car will be so freakishly loud that a cop will most likely pull you over and write you up a fix it ticket.