These are new products that are built according to the same specifications as an original part, although not supplied by the original parts manufacturer. Products in this group are typically cheaper than items in the Original / OE group. Parts in this category carry at least 12 months warranty.

The NGK Standard Spark Plug is constructed from durable material that is corrosion and abrasion resistant. The spark plug insulators are made of 99 percent pure alumina silicate, allowing for longer insulator noses for reduced fouling. This spark plug features a triple gasket sealing process that eliminates fuel leakage. It also includes a solid copper core that provides superior heat dissipation and conductivity. This spark plug has resistor that is produced with a glass and carbon mixture, which is fired to ensure superior performance and durability. It has corrugated ribs that prevent flashover and cold rolled threads to inhibit damage to the cylinder head. The heat range numbers convention used by spark plug manufacturers are generally the higher the number, the colder the plug. another note: the image shown portrays a single probe over the electrode, where in fact these have 4 of them. So don't go by the image you see, go by the part number... extra: these are the same OEM equipment, but at a fraction of the dealer cost, and if they last as long as the originals, I won't need another set for another 184,000 miles (yes, the originals seem to have lasted 12 years, as far as records go.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!

Ok guys, I see the same questions asked over and over about spark plug selection and fitment, so I hope this information below helps.Jan 2021 Update : I'm still running these plugs in my 2006 Mini Cooper S after 5 years and 50K + miles of driving. These were a great replacement for the original Bosch plugs. The first generation R50, R52, R53 petrol models were fitted from the factory with the NGK: BKR6EQUP with the EXCEPTION of the R53 JCW, this was fitted with the NGK: BKR7EQUP. This is the correct plug for most E46 Series BMWs. The price is a small fraction of the dealer cost. It is of the same high quality as every other original part on your BMW. The other clear choice for plugs is the Bosch. Both are of equivalent, superb quality.

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!Now I've got you wondering "So what's the best spark plug for my Mini?" That all depends on what you do with your Mini, and of course your budget. If your Mini is your daily driver and you rely and trust your dealer (they know best!) then you may as well stop reading now. If on the other hand your Mini is your daily driver come weekend warrior, or is just your weekend warrior, and you do your maintenance yourself then read on. Question 4: is although the Iridium is seen to be the performance spark plug, the fitting of the Iridium spark plug itself will not give any power performance gain. Many people report that when they changed from Platinum to Iridium, they felt a livelier throttle response, when in fact what you will have done is simply renew old tired spark plugs with fresh new spark plugs. The ignition system now performing as it should do, thanks to the change of tired old, for new fresh. The material change in the case of Platinum to Iridium has played no difference! The other question (Q1) will be answered as you read on. The term spark plug heat range refers to the speed with which the plug can transfer heat from the combustion chamber to the engine cylinder head, it has been found the optimum combustion chamber temperature for petrol engines is between 500 degrees C – 850 degrees C. Within this range it is cool enough to avoid pre-ignition and plug tip overheating which can cause engine damage, while still being hot enough to burn off combustion deposits which cause fouling. the original ones say "NGK" on one side and " BMW " on the other..., where these new ones don't have the "bmw" letters, just the part #. and NGK... BKR6EIX Iridium tip, this is an alternative replacement for the BKR6EQUP with the same heat range (6)