If you do a google image search "270 ohm 5w resistor" you will see both types they do the same thing just transfer the heat generated differently.
Four white cement ones are used in the standard Crack when the speedball upgrade is add two are removed and two large heat sinks are used instead.
The gold ones are wire wound but in=cased in alloy to transmit the heat to the case. Crack case is open underneath with vent in the top plate for air circulation.
Here's a pic of a standard Crack and then with speedball note the extra circuitry and the two large black heatsinks which replace the two long white cement resistors shown in the lower half of the first pic.
Thanks very much for explaining the resistors and heat vent.
BTW, I saw some pictures of your crack with speedball...very neat and nice. Wondering how the holes were cut on the carbon fiber around the vent?
I am also quite curious to know how the huge capacitors and the resistor cylinder that you added can improve the Crack with speedball? What do they do?