These will be ran with just extensions, no other exhaust components. I have no problem cutting a hole in the inner fender other then the front tires may hit when I turn hard (27''). As stated I'm not a fan of headers with the collector welded in place because they seem to rub loading the car on the trailer and other places. I was looking at the hedman 75140. I like the slip tubes and no collector flange. Looks like they don't make the hooker 5303 anymore?