| The reason is because those pipes seem to build up crud and block coolant from flowing. This is absolutely fine if you are not driving your car in severely low temperatures. Safety Boost Cut Solenoid removal - unless you are running a boost controller, do not remove these as doing so will result in boosting at 7 psi instead of the 9 psi you normally would boost at in stock form. Plenum Exchange is only if you wanted to exchange your plenum for a chrome one or painted/powdercoated unit. Throttle body replacement is if either you have a throttle body that's leaking or want to upgrade to the larger throttle bodies. Hope that helps.
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