We drove down the street and back with open headers once,and wont do it again.
We actualy had some lady run into our shop and start yelling at us,of course she was truspassing (sp) and we told her to F off,but still.And anthor time one of the drunks a few shops down got all pissed off cause we were runing the open headers for a moment.
Use mufflers,save your ears.
And unless you got a restrictive collector,small pipes, and a small over lap cam,then you wont get no more power.