I'm going with the 18g kit (rated for up to 700hp). The reason is because it will allow me room to grow if I decide. The 16g is for someone who only wants to go as far the stock block can handle. The 20g is for someone who wants to go big...a lot more involved then just a few simple upgrades.
Also you are correct about the missing items. You will need to buy an oil cooler---$200-$650, the gauges----around $900 for them and the spark plugs will be around----$25-$30 each. You may also look into upgrading you clutch, if you have a manual and a new exhaust system. Don't get me wrong I was told the system will work just fine with the stock exhaust but a 3" exhaust wouldn't hurt.
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