According to schematics, the current through the LEDs is controlled by the the 220R resistors. Replace them all with 110R resistors for maximum IR lols.

...Although, the fact they have used two transistors in parallel implies that the forward current is already quite high for them (the transistors). So, will doubling it cause any problems? If not, why use 2 transistors?? Can the LED even take any MOAR juice anyway?

Who will try to find out?