i need some advice
 

what are some easy cheap mods you can do for both a ca20e and a ca18et?

cone filter / a more free flowing exhaust / advance the timing a few degrees (ca20e & ca18et)

boost increase 2psi max without intercooler / with intercooler 8/9 psi increase (ca18et)

what you mean by advancing the timing a few degrees and for the boost i need the boost controler, right?

Ignition timing

the sayandard timing is set at 15 DBTC with standard boost you can increase this to 17.5 DBTC to give you a few more BHP`s and better off boost power. Always check for detonation!!!! After adjusting timing !!!

You can up boost afew different ways it depends on how much you want to spend.

1. Drill a hole in the pipe going from the turbo to the actuator. Start off with a 2mm hole then drive and check boost. If you want more boost increase the hole size. This is the cheapest way. This way will weaken the actuator tube ands possibly cause it to break, if it dose it could damage you turbo or engine!!!

2. Bleed valve. This does as above but you can regulate it vie a screw

3. Shorten the actuator arm. This will stop the waste gate opening fully thus increasing boost

4. Electronic boost controller. This is the safest to boost

sweet can't wait. im trying to get my s12 to be one of a kind in north america. one show car and one drift :D