if you replace the exhaust all by yourself it's a HUGE pain in the neck to do it w/o taking the bumper off.  If you have a friend who helps you balance the 30+ lb of stock muffler in place it's OK. 
 
But thinking about when I replaced my stock muffler with a GHL, the biggest pain was do get these damn "U" pipes which connect the muffler with the secondary cats into the muffler, talk about a TIGHT fit ... 
 
But my general question is: Unless someone gives you the "S" muffler for free, why bother, go with a nice aftermarket exhaust which really makes a difference... 
 
Hey and these aftermarket exhausts tend to be much lighter and smaller which makes the installation so much easier
		 
		
		
		
		
		
		
			
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				I still wave at Boxsters, but they no longer wave back :-( 
2002 Boxster S "Violet" (sold but not forgotten) 
2009 Carrera 4S "Kelsey" (current ride) 
2015 FIAT 500e "Nikki" my commuter car
			 
		
		
		
		
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