I dont know nothing about these hondas and what can fit and all of that, so my problem is.

My tranny took a dump on me in my 99 civic si. Cant find that same tranny anywhere, so what other transmissions could bolt right up?

Talking to something, what about a 99 GSR tranny? is that a direct bolt on?

 

All manual b series tranny will right on.

 

yeah any manual hydro b-series tranny, so a ls, b16, gsr or type-r will work

 

good, how will the 99 gsr tranny be in my car? they have longer gears right? Would i benefit from it or no?

 

it will increase the fuel economy slightly... I love my Gsr transmission on my setup...

This site should help...
http://www.fatboyraceworks.com/gears/

 

Is this a performance vehicle? Meaning, do you have any plans at all on doing things to this Si, or is it simply a daily?

If a daily, get a LS tranny and call it a day.