I just received and installed my new Magnecor 8mm wires yesterday on my '08 Silverado with the 5.3L. I bring this up, because I noticed a much bigger difference in power, response than I did with the MSD's on my '00 Vette. I know the motors are slightly different, but the coils and wire lengths are the same. I was very impressed with the Magnecors (recommended by Bob Bailey for the LTCC) and just wanted to pass the word about, in my opinion, the best plug wires around. I've used Taylor 8mm, MSD 8mm, and now these. I also recieved their 10mm race wires for my boosted LTX project, and can't wait to get them on the car tonight. If you haven't read Magnecor's explanation of spark plug wire manufacturing, I suggest you go to their website and get informed. The face that they mention Electro Magnetic Interference (EMI) and rdio interference impresses and sold me, as I have had problems on my LT1 with EMI in the past. I just wanted to let you guys know my opinion and results.