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This is another reason we replace the wires, the stock wires have a very large boot on them that many times do contact the headers, causing the boot to burn. Worse yet, sometimes the wire touches and burns through. Many people then spend money on heat socks to protect them. Instead of doing something like this, we put in MSD wires which, not only are a much better performing wire, but have a much smaller diameter boot, and the boot itself is flexible, allowing you to position it away from the headers.
On the front of the stock plugs being "rated for 100,000 miles"
Remember, it says "up to" 100,000 miles. Also, this is on a completely stock car. A tune, headers, intake, etc all will dramatically shorten the life of the plug. We also move to a copper plug, which carries much more energy and handles heat much better than the fine wire iridium plugs do. They have a shorter life than iridiums, but that's ok. Have you ever tried to change plugs that were in a car for 100k? Not fun at all.
If we are really honest with ourselves, all of these mods are to increase performance, so why would you want to skimp and reuse stock parts that can inhibit performance? That doesn't make a ton of sense to me. Of course, to each their own, but there is no way that we would ever skimp on a job as we feel it's a case of penny wise and pound foolish. The honest way to look at it is if the customer cannot afford an extra ~90 for plugs and wires, he really, really should not be modifying their car in the first place. The programmer? Absolutely, it is an optional piece, but many people request it to be included as they like having their stock tune at their disposal at all times.
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