I've been happy with them. When I got them I already had an aftermarket muffler, K&N intake thing and 33" tires. They seemed to wake the truck up beyond 3500RPM, under that I don't think there is any difference. I know a few have complained about them recently but I haven't had anything to complain about with mine. When I got them they were about $300, I sprung a little extra for Percy's gaskets which were around $40.
I have a brand new JBA headers set with gasket for a 2001 tundra 4wd.
I never got to use them I bought them just before I traded the truck for a 2010. So, I never got them installed. I would sell them for $400.00 brand new, never installed, still in the box.
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