Hey, if your gonna switch your midpipe every year for emissions you might as well get a mide pipe with no cats. That will probably make and SLP cat back WAY to loud for most people. My magnaflow sounded ok w/ the stock mid pipe, too quiet for my taste. Now that I have got my prochamber it just sounds bad, not too loud not to aggresive. Plus mid pipes without cats go for around 200$, and givesmore power.
Less $= more power
