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			Are you planning on driving the car on the road or will it be a track car only?  If you plan on driving it you would be better off leaving the headers/y-pipe as is and just get some obnoxious muffler if you want to make noise.  You won't gain any power by changing out the headers/y-pipe or the muffler but being loud seems to be the goal for a lot of people.  The Loudmouth or TSP Rumbler should be loud enough to attract the attention of everyone.
		 
		
		
		
		
		
		
			
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				69 Z28 JL8 4 wheel disc brakes - being restored 
09 Silverado Z71
			 
		
		
		
		
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