If you're looking for performance, or a throaty rumble, i'd stay away from these mufflers. I had them on my 82 Z and other than the cam shaking the car, you could hardly tell the car was running. They didn't seem to any more power than the $20 mufflers, i buoght from midas.
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10.3:1 355
comp custom grind cam 248/251 duration .531/.542 lift
Pro Action iron heads 200 cc intake runner 2.02/1.60 valves
victor jr intake
750 holley d/p
K&N Air filter and breathers
MSD ignition
th-350 B&M shift kit
3500 rpm jegs converter
4.10 gears | 
