These are with the PSE mod
This will not give much if any improvement on the older mufflers.
There is another mod with a ~1.5" "J" pipe between the inlet and outlet that works well on the older style mufflers. Look at these.
996/997 Sport Muffler
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2013 991.1 Carrera S Cab
2004 996 Turbo CAB X50 sold
2003 996 cab 6 speed Sold
1972 RS 3.2 twin plug short stroke crank fire, roll bar, sold
DE instructor since 1985
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