I have the Mugen thermostat, radiator cap, and fan switch for sale. They are used and have about 20k miles on them. They are otherwise in fine working order.
I will not part these, they are designed to work as a set. With these in place of the stock parts, your cooling system will operate about 10°F colder than stock. I have personally seen the difference with my OBDII datalogger. I have returned to stock because I have decided I do not need them on a daily driver that never sees track time. These parts are geared more for someone who tracks their car, or any situation where the car experiences extended periods of high load.
According to Mugen, the radiator cap will only fit the OEM Denso radiator. Some Preludes have OEM radiators made by a different manufacturer, make sure yours is Denso!
The fan switch is actually the S2000 switch. Several years ago, the Mugen Prelude switch was not fitting properly. Todd from NTPOG (Marcucci Motorsports) machined a stock thermostat housing for me to accept the S2000 part. I am including this housing for free. The S2000 and the Prelude switches have the same operational temperature.
Here are pics of the parts along with links to each part on the King Motorsports website. The original prices are on the King pages.
Thermostat:
[img]http://www.*********************.com/wetoddimage.wtdr/wODkyNDI3NnM0MTNkZmQzMXk1NDE%3D.jpg[/img]
[img]http://www.*********************.com/wetoddimage.wtdr/wODkyNDI4NnM0MTNkZmQzMXk1NDE%3D.jpg[/img]
http://www.kingmotorsports.com/product.asp?detail=137
Radiator cap:
[img]http://www.*********************.com/wetoddimage.wtdr/wODkyNDMwNnM0MTNkZmQzMXk1NDE%3D.jpg[/img]
http://www.kingmotorsports.com/product.asp?detail=3303
S2000 fan switch:
[img]http://www.*********************.com/wetoddimage.wtdr/wODkyNDI5NnM0MTNkZmQzMXk1NDE%3D.jpg[/img]
http://www.kingmotorsports.com/product.asp?detail=1466
Link to Prelude fan switch info, for comparison:
http://www.kingmotorsports.com/product.asp?detail=135
$100 + shipping takes all of this.