First, believe me when I say I'm not being a smart arse or condisending...the best thing to do is to paeticipate in some HPDE's and fine tune your driving skills. Your S as built will rarely be pushed to use all the horsepower it currently has. The power to weight ratio and the go cart handling make it one of the most fun experiences out there. Once you have taken it to its limits, start improving its performance. Just my opinion.
The suspension is already better than my driving skills will let me drive, so improving the suspension is the last thing on my list of mods. Making it go faster is just fun and I can do that in a straight line!
A bigger intercooler and/or water-meth injection and more open exhaust will give you more oomph!
Helix Stepped Core Intercooler
Helix is proud to be the innovator of the world's first Stepped Core Intercooler.
The Helix Stepped Core Intercooler design has a bigger frontal ambient face combined with thicker-than-stock core that seals to the radiator fan/shroud. The cast end tanks have factory charge pipe angles. Unlike stepped-core copies that have surfaced, the Helix SCI features cast end tanks for reduced turbulence and bull-nosed bars on the ambient face as well as the hot side of the intercooler.
This increases air flow across the face of the intercooler as well as reducing pressure drop through the core. The core of the Helix SCI has increased fin density and will flow 250 horsepower with only a 0.5PSI pressure drop, while greatly reducing heat soak.
Installation is relatively straight forward and requires no cutting, drilling or permanent modifications to your vehicle.
Please see the graphs to the left showing the results from the data logging of our stock R56, with only the Helix Stepped Intercooler installed. The graphs compare intake manifold temperatures between the stock intercooler and the Helix SCI as datalogged on the street in similar conditions