it sounds like u want to keep ur stock exhaust tubing and bolt up a aftermarket muffler in which caseu should visit summitracing.com or shopmufflers.com which is kinda one in the same lol. summit's preety good about listing dimensions, if not call em up cus more than likely ur stock exhaust is gonna be huge length and width compared to an aftermarket manifold. save som money and get dirty lol labor at a muffler shop is crazy expensive