Just so you know, the pioneers he has listed are not made for the Mach 460. They are the same size, but they are not "drop-in replacements" for the stockers. He probably got rid of it because it didn't sound as good as he'd hoped. The stock mids are low-passed, so dropping a set of 4-ways was a waste of time. You run the risk of frying the amps, also, because they're not made to be run at that low of impedance. Also, ask him if he included the front amp, that's situated under the HU. This one's for the tweeters and without it, it won't work. My guess is that he wasn't happy with the way it sounded after he installed the pioneer's, and he went aftermarket rather than replacing them with stock mids. What wiring exactly did he say was included?