well from what i asked my mechanic yesterday he said as long as i dont mess with the cat i will pass inspection and i already have a thrush muffler on now but i want louder so thats why i went with the glasspack and half the time i cant here the engine whenever the bass lines come in so, and had a tune up a few weeks ago then something in my ignition was shorting out my coils so replaced the same coil twice till they realized what was burning them out and thanks for all the help hopefully ill get to put it on this Saturday if im off work