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The the breakdown is that the swirl pots reduced aeration of the oil but slowed oil return. The 997 return tubes return oil faster in theory allowing for more oil to be available at the pick up tubes. The 997 tubes bolt right in and are considered an upgrade. You would add a windage tray if you’re concerned about aeration.
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-1999 Boxster 3.4L swap/NHP Headers/Fabspeed maxflow/ Coilovers/GT3 arms/adj. rear toe links/Tarret front and rear bar/UIDS/UAOS
-2002 911 Turbo -JRZ RS Pro/GMG swaybars/RSS/Billet k16s/ Markski turbo inlet pipe, tune, 3” exhaust, intercoolers/GT3 seats w/red GT3 belts/CCW classics
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