the original question is about the shroud- and yes you should definately have it on. the car will run very hot at idle and low speeds. autocrossing would be the easiest way to overheat it. without the shroud, the fan is pulling air from wherever (most likely under the car), bypassing the radiator.
its unforunate theyre such a bitch to put back on, but you def need it if you keep the stock fan. i couldnt get mine back on, so i ran without, and my car got hot as hell after 1 autox run.
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