NGK (4285 BKR7EQUP Laser Platinum Spark Plug, Pack of 1

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An unaltered engine will run within the optimum operating range straight from the manufacturer, but if you make modifications such as a turbo, supercharger, increase compression, timing changes, use of alternate racing fuels, or sustained use of nitrous oxide, these can alter the plug tip temperature and may necessitate a colder plug. A rule of thumb is, one heat range colder per modification or one heat range colder for every 75–100hp you increase. In identical spark plug types, the difference from one full heat range to the next is the ability to remove 70 degrees C to 100 degrees C from the combustion chamber! PORSCHE CAYMAN (987) I CAYMAN I (987) PHASE 1 3P 2005-11->2009-12 2.7i 245 F6 24V (180kW) -M9720- A5 PORSCHE 911 (997) V 911 CARRERA V COUPE (997) PHASE 1 2P 2004-07->2008-07 3.6i 325 F6 24V 4X4 (239kW) -M9605- A5

All the above mentioned NGK spark plugs have a Platinum ring around the electrode tip, NGK also provide the following with an Iridium electrode tip, however be careful as the following have a tip projection of 1mm extra in length over the above! PORSCHE 911 (997) V 911 CARRERA V CABRIOLET (997) PHASE 1 2P 2005-04->2008-07 3.6i 325 F6 24V (239kW) -M9605- A5 PORSCHE 911 (997) V 911 CARRERA V CABRIOLET (997) PHASE 1 2P 2005-04->2008-07 3.6i 325 F6 24V 4X4 (239kW) -M9605- A5Manufacturers don't seem to want us to be included in the ownership process; there seems to be a 'dark veil' surrounding the act of questioning their decisions: ...'filled for life'...'they all run hot'...'they all need premium plus fuel'...'manufacturer fluids only'...with dire consequences of warranty violation. PORSCHE CAYMAN (987) I CAYMAN I (987) PHASE 1 3P 2005-11->2009-12 2.7i 245 F6 24V (180kW) -M9720- M6 PORSCHE 911 (996) IV 911 CARRERA IV CABRIOLET (996) 2P 1998-02->2005-06 3.6i 320 F6 24V 4X4 (235kW) -M9603- M6

BKR6EIX Iridium tip, this is an alternative replacement for the BKR6EQUP with the same heat range (6) PORSCHE 911 (997) V 911 CARRERA V COUPE (997) PHASE 1 2P 2004-07->2008-07 3.8i 381 F6 24V 4X4 (280kW) -M9701S- M6PORSCHE 911 (997) V 911 CARRERA V COUPE (997) PHASE 1 2P 2004-07->2008-07 3.6i 325 F6 24V (239kW) -M9605- A5 PORSCHE 911 (997) V 911 CARRERA V CABRIOLET (997) PHASE 1 2P 2005-04->2008-07 3.8i 355 F6 24V 4X4 (261kW) -M9701- M6 Ok guys, I see the same questions asked over and over about spark plug selection and fitment, so I hope this information below helps.