I got the spacer for my 2000 Toyota Tundra V8 a day early. I installed it in about an hour. I did not think the installion instructions were discriptive enouph and could have used a few more pictures. There was also no arrow to show me which derection to install the spacer. I had to use the bolt holes to line it all up. The pictures were of my exact engine which was great. I have a lot of basic skills in automotive repair and installing the spacer was easy but I was given throttle cable bracket mounting extensions and with such engine specific instructions they still did not explain or show how the extentions installed. Otherwise I would have had it installed in 40 minutes. I noticed right away that the tone of the muffler got a litle deeper and upon my first drive I noticed the truck jumped off the line quicker and accelerated harder than usual. I have had it installed for about 2 weeks now and I am still enjoying the better acceleration it has given me in the form of low end torque. I wish I could hear the whistle it is said to make but I think my intake and exhaust drowns out the sound. Bosch 4 Iridium Fusion plugs, Cold air intake, Throttle body spacer, and cat back super 40 flowmaster exhaust. Next step is a power programmer, performance MAF sensor and headers. Definately glad I purchased this product even though I was hesitant at first cause of mixed reviews.