I tried bolt on TB spacer in my maxima cold air intake, exhaust. Honestly if you want real HP gains get a super,Turbo, stroker kit/cam, Nos or get a cumminsLol. You started out being a sceptic but now you're all in. Amazing what this site will do to a man. Believe it or not I was convinced that a TB spacer would be a great first mod. But after doing some research I found DT and learned that it would be worthless.
Easy bolt on stuff is a waste of money. I did start as a skeptic but it is a reasonable upgrade, one I don't need but if I get a good deal I will try it.