What is that? let me know guys...

 

It's a rev/speed meter. Basically it's an accelerometer with additional features.

 

remove speed meter means no top speed?
is it hard to install it?

 

no,no REV(as in revolution per minute) speed meter.
Try searching in google or yahoo: type in apexi rsm and search.

 

how about installation? somebody told me that with apexi RSM no top speed... i dont know... thats why i wanna some info

 

This WILL NOT remove your rev limiter or speed limiter. It will not alter ANY charactaristics of your car. It will just monitor certain operations going on. Did you not read the info when you searched?
http://store.racinglab.com/aprsrevmet.html

 

RSM WILL remove your speed limiter.

 

oops, i meant that it won't remove the rev limiter. The rsm tricks the ecu/speed sensor to cut the speed limiter out IIRC.

 

does that still give you a cel. and if it doesnt then does naybody know how it goes about doing that?
one other question thats kinda dumb is the service engine soon light the light that people refer to as the cel?