I think all of our heavily modified vehicles will never see the use, they once did in stock form. The 95 ex gets worked on more than used, and has logged around 10k miles in the last 10 years. It has beefed up parts, that make stock parts, look like toy parts. These parts will be abused harder than stock parts, and can (& will) succumb to failure, just like stock parts do, but...As I always say, it's better to overbuild, than under-build.
Now lightly modified vehicles is a different story. If your hopping up your stocker, just to make it a bit faster, handle better, and just more enjoyable to operate, that's when these systems/parts are really put to the test for longevity & reliability. I also think that some items are best left alone in stock configuration, just for that reason.
So, if a stock part can last for 100k miles, and the vehicle is already 20 years old, and the chances of it going another 100k miles are slim, why not just use a new stock part? This is where the cheap overseas replacement parts kick our ass, and this line of reasoning. So what do we do now? Blind faith,with trial and error, is the only answer I can think of.
One of us should start a trusted parts forum, that people can submit what products they used, and reviews of success or failures. Can have a OME & an aftermarket section. Just an idea here, but it seems too many of us keep spending hard earned cash, only to find it failed, or is sub-par to expectations/hype.
I think I will keep my 5.0 as close to stock as possible, and only do very mild upgrades. When the time comes, I hope to get as much help/input as the rest of you have gave on this site.
