i'm running a slightly moded 307,2.56 gearing,2 inch stock exhaust and a cherrybomb glasspack,which is about 5 months old,it makes a nice rumble in first and in idle,but sounds the same when you floor it,my previous cutlass had the same exhaust,not sure of the brand glasspack but since it was 2 years old on a daily driver it made the 307 sound much louder,but over time glasspacks just become a holled out stright pipe,anyway i rather like the sound of dead stock 350 olds and dead stock exhaust,but if you want it loud, dual straight pipes and race mufflers are the surefire way,I'll find out when i get $300 for it :shock: