On the boost gauge at 5500 feet back home I went from a solid 4 lbs to just barely touching 6 at the top of the RPM band when I changed pulleys. You likely got the boost in power (1.5 psi maybe), but I didn't feel anything major myself. I did notice a little difference though. That being said I...
If I had the slightest shred of artistic talent I would have something like that. Cool idea, especially if you maybe did a flat vinyl wrap on the rest of the truck to wrap it all together.
As the above states, I am looking to purchase a set of stock exhaust manifolds off of a 2005-11 1GR V6 Tacoma. Let me know what you've got and how much you'd like for them.