I am doing the TB bypass tomorrow and was wondering what kind of improvement I should expect?

 

Nothing that you will be able to notice or feel, especially once the car is up to operating temperature. The TB still gets warm due to conduction and convection under the hood. It just wont have warm coolant flowing through it anymore.

 

Yeah what he said, slim to none gains really. Tb stills gets too hot to touch after it's been running.

 

This ws6.com before/after dyno run indicates 6ish hp, seems extreme for such a simple mod but hey... Not gonna feel it but that's a pretty decent gain if it's accurate, I would have argued 1-2 hp would have been doing good without the dyno run...
http://www.ws6.com/mod-8.htm

 

It's a free mod, and you get what you pay for. That should answer your question.