Getting my ponies to run faster--I'm bored, Have you tweaked an Ljet? Options

[computers4kids]

I have a stock 1.8 with an Ljet that runs good but not the fastest gocart on the block. I've done a bit of reading on my Ljet and am looking for any tweaks to get some more horsepower--I know, I'm starting down that slippery slope. Here are some ideas that I've heard about...what do you think...

Raise the fuel pressor on the system to 60 psi---rams more fuel through stock injectors...suppose to even atomize it a bit better.

Install a variable pressure regulator with a higher pressure fuel pump that senses engine load off the manifold which then increases fuel pressor with more demand.

Play with the air/fuel mixture screw

Loosen the tension on the air sensor flap

Trick the CPU with resistors into thinking the engine is cold thus enriching the fule mixture

Put an aftermarket kit on the cold start valve as a way of pumping extra fuel into the system when throttle is moving towards full throttle position.

Put a wind-up propeller on the back that can be released when extra umph is needed

Any ideas????????