I’ve been working on a Linksys WRT54GS router.

Running DD-WRT v24

Finally wired in the fan. The fan was an 8.6v unit, so I ran a bunch of resisters to drop the voltage to not burn out the fan. 

Heatsink installed.

Transmit power up 30%

Overclocked to 216Mhz.

SUPER ROUTER!

AND, it all fits in the stock case!