I have an under bonnet solution but its not exactly pretty on the inside. My Pod is chilled within an insulated foam box wrapped in heat resitant foil so once the bonnet is lifted you see a rather messy box. It will soon be replaced by a full fibreglass and carbon fibre box but not until after my new engine is installed this coming weekend.
I also have the suteki cold air induction corner indicator flow to help out. It is the stage one of the full air box still in development.
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From the outside:
