It all depends on what you mean by eBay items, obviously you can get top-notch brand name stuff on eBay. Assuming you mean the usual no-name cheap eBay stuff, I've bought quite a bit of stuff for all of my Honda/Acuras over the years on there that has worked perfectly. Right now I have a generic black intake (with K&N filter) for like $35, I've gotten a few other intakes on there as well...strut bars, steering wheel and quick-release hub (these were NRG, a name brand although not exactly Momo, etc...but not the cheap $25 steering wheels you see on there), header (I've got a DC header right now that came with the car, but I've had cheap stainless ones work fine for years), short shifters (again not on my current car, but I've never had one snap!), as well as any cosmetic items like corner/bumper lights, pedals, shift knobs, indiglo gauges (obviously back in the day)...never had a problem with any of these items, personally.