i got one of these for my Celica as it was still hitting "the wall" at 112
http://www.gtschris.com/store/comersus_ ... roduct=124 i'm not sure if it'll work the same on a Honda?
The one i bought a couple of years ago was a bit tidier, but doens't really matter if it's all behind hte clocks. I didn't install it myself, i had a jap specialist do it.
It works by reaclibrating the existing clocks to MPH. So the little MPH sticker goes straight over the KPH bit on the speedo, so it keeps the cut at 180, but it's now reading MHP not KPH, so will take some seriuos tuning to get it ot cut at 180 MPH.
I'd definately check if it's gonna work on your car befoe you buy though, probably message him via his site, i think he was pretty helpful on the phone when i rang him.
HTH

Be a pigeon, not a statue.