This is a very good quality product and installation was very easy, the spark plugs also come with a guarantee and this is the official NGK guarantee . Overall I put them on about a month or two ago, have ridden them over 1500 miles and made a 1200 mile trip in 2 days. At one point in my trip, I drove 115 miles on 3,599 gallons of fuel, which is about 32 mpg. I haven't had any problems with these connector cables so far. I would suggest replacing the distributor cap and distributor rotor (probably the distributor coil as well, but usually the distributor coil works or not) along with the spark plugs and normal maintenance (fuel filter, air, oil/oil change). The difference these products make to your engine is incredible and it is very rewarding to see the savings on the pump. (23mpg was the highest I got before these parts were replaced)
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