SPW8100 - UltraPower 8.1L Magnum Spark Plug Wires

SPW8100 - UltraPower 8.1L Magnum Spark Plug Wires

Part# SPW8100 - UltraPower 8.1L Magnum Workhorse Spark Plug Wires


UltraPower Magnum Spark Plug Wires are patent protected because of the unique method of producing these wires which have extremely low resistance while maintaining very high noise suppression. The benefit of this invention is that full electrical energy from the ignition source is transmitted to the spark plug. The end result of the application of this method is increased horsepower, torque, fuel economy and a smoother running engine.


  • Patented Solid Stainless Steel Core Spark Plug Wires with RF Eliminator
  • The technology in these wires comes straight from Nascar and is not available on the open market. They are made out of a patented zero OHM, solid core stainless steel wire wrapped by silver plated copper conductor wire and are outfitted with an RFI eliminator collar that guarantees no interference with radios.
  • These wires must be installed with GM factory heat shields which may be reused off your old wires.
  • High temperature silicone boots, 8mm jacket with fiberglass-reinforced braid that resists temperatures up to 500°F.
  • Increase power to the spark plug up to 400% over stock!
  • Adds up to 15HP on Big Block GM engines.
  • True Life-Time Lasting Wires, Life-Time Warranty!


  • Workhorse chassis with 8.1L (2001-2011)
  • Workhorse chassis with 6.0L (2004-2006)
  • All GM vehicles with 8.1L (Silverado, Sierra, Avalanche, Yukon XL)
  • Industrial applications with 8.1L (Generators, Forklifts, Pumps, Compressors, etc)

how do you remove the heat shield off the wire
( joey, 10/18/2018 )
They just slide off. If the wire has gotten really hot it's possible that the rubber boot has melted to the inside of the heat shield which would then require replacement. ( Support )
HI i have a 2001 Silverado HD 4x4 with the 8.1 and Allison tranny I was wondering you folks suggest the ACDELCO 101 plugs from what i see in the truck forums they all suggest the 993 now that they stopped making the 992 ACdelco plugs, i just purchased your SPW8100 - UltraPower 8.1L Magnum Spark Plug Wires, ....so why do you suggest the acdelco 101. is there much difference?...thank you so much. ( Darrel, 04/15/2018 )
The 41-101 is the best suitable iridium spark plug to replace the 41-993 platinum. We have been using the 41-101 for many years now with no issues. ( Support )
I'm getting ready to install these wires. What would the plug gap for AC Delco 41-101 be? I've read 45 as well as 60.

( Jack Blacklock, 02/24/2018 )
The 41-101 come pre gapped at .060. You can adjust them to .045 for a little better performance but it is not required.  ( Support )

How hard are these to change on a Motor Home? What type of connection is on the opposite end of the spark plug end?

( Jim Smola, 01/08/2016 )


We have found that it is easiest to change the spark plug wires from inside the wheel well. Just turn the wheel the direction you are working on to full stop so you can get in there and once completed with the one side do the same on the other. The other end of the spark plug wire (the coil side) is just a push on fitting like the spark plug end.

( Support )

What do I do if one of these wires ever has a failure?

( Lyle, 03/14/2015 )

You would just call us, we will give you a RMA number for the wire for you to send back and we will send one out right away at no charge.

( Support )

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 The state of California requires that this warning be posted for people purchasing products that reside in California.

WARNING: Products may contain one or more chemicals known in the State of California to cause cancer and/or birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov

VIN Verification Service Item

This product allows for a VIN verification service.

  • This is a service that we provide free of charge when a part is purchased.
  • When you provide your VIN below we will personally verify your part selection by your VIN before shipment of your order.
  • This helps ensure that this is the correct part for your vehicle.
  • This is not an automatic VIN check, it is done by a parts specialist once order is placed.
  • We can only VIN verify vehicles back to model year 1996, if older we can help but can't guarantee fitment.
  • If you would like to have your part selection verified before purchase please call or email us.

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  • $202.49
  • $149.99

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