ok i'm goin with the s300 and was wondering alittle bit about wideband? exactly what is it for, and what do i need?

 

A Wideband is just another one of the tools you can use to keep your motor from blowing. Don't waste your $ with a standard AFR gauge, get a wideband

I think Hondata recommends you use the PLX along with the S300, theres a thread on it already.

 

Here's a little info being you are choosing the s300.

http://www.hondata.com/techwidebandtuning.html

 

it says that i must have a stage 4 as datalogging is used, what's that mean. and do i need another o2 sensor or will i be able to use my stock?

 

That article was written before the s300 came out, it's more of a guideline on using a wideband to tune. Don't worry about the stage4 stuff, the s300 comes with everything you need to use a wideband. You can either replace the stock one, or put another bung nearby and wire it as an extra just for tuning.