The XLF option is the Porsche Sport Exhaust (PSE). Two stage with vacuum controlled valves to allow it to pass noise tests. The valves are controlled by a switch on the dash and with a computer override to close the valves at certain RPMs to allow it to pass european noise tests. Many disable the valves to always "open" which is the same as the stage one mod. If you want a little more bass do the "Orange" cap mod on your intake.
Anyone got a spare Orange Cap tey can send to UK? - Rennlist Discussion Forums
http://www.renntech.org/forums/topic/6422-intake-air-box-modification/page__hl__orange+cap
Orange Cap mod - Page 2 - Rennlist Discussion Forums
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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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