I'd have to agree...with the hunterworks kit, installed mine yesterday, took about 2 hours, I am sure now that I've done it, I could probably do it in...about 1 hour or less next time around. The hunterworks kit supplies you with a multitude of jet settings, so you can change them around for different applications. I would almost think that just changing altitudes, you could benefit from just the TPI valves and not the full jet replacement, but I am NO means an expert on the subject. Once you do the jet replacement, you can't go back to original settings because you drill a hole in part of the diaphram. I guess a person might be able to put a small screw in that hole (?) to go back to original...again...I am no mechanical genius (obviously) but the jet replacement was a pretty easy task. I mean no disrespect to other vendors, but I am 110% happy with the hunterworks kit and would not hesitate to work with them again. If you go to the website that sells this kit, there is a installation video, watch and you'll kinda know what you are getting yourself into. Hope this helps, oh here is the link.
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