I recently met up with the g8 group from Long Island. One person had electric cutouts on his G8. I am considering them for mine. I have the Magnaflow cat back so no resonators or mid muffler. I have a few questions. How hard are these to install do I need a muffler shop etc or can I do this myself ? Secondly even thought I am really putting this in cause I want my car louder will I see a hp increase some claim I will ? Thanks.