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For reliability, I'd add an AOS (personally i'd go either IAG or KillerB). The dom cylinder 4 cooling mod, a KillerB oil pickup/baffle combo, and a nice aluminum radiator (i have csf, koyo is good too, or if youre big ballin, KillerB). i'd also add an equal length header (not sure if this comes standard in germany or not). and then of course, gauges to monitor oil temp/pressure and a pro tune.

as far as the freezing lines in the AOS, mine is an IAG AOS, my winters here in virginia arent as bad as yours but even in sub-freezing temps ive never had an issue.

Welcome to the forum and enjoy the car
 
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