He posts at cz28.com
Advantages are that the engine bay temps are lower, easy install, and easy to work under the hood still. Also, the long intake pipe acts as a sort of intercooler. I think he's trapping 14mph faster.
Lag isn't an issue, he claims it is spooled by 3000rpm. I helped a buddy install a front mount for his supra over the weekend, when you laid out all the pipes in the kit it could stretch from front to rear of the car, so i don't think this kit is all that bad.