The KLX seems to have have more mid-range torque. DJ kit includes a 116, 120, 124, 128, & 132. The 116 I would not bother with unless you live in high elevations and keep it stock. The 120 opens up the potenial power. The 124 gets things moving with improved air flow. The 128 is best for open intake and high flow exhuast. The 132 is best for racing with high flow intake & exhuast. Also works good for bore-up mods.

With the snorkle gone on yours, thats more air to mix with fuel. The 120 would be best for higher elevations. The 124 is best suited for lower elevations.