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3 purges is adequate. that is what we do with our chemical plant reactors.
as for not getting ultra high purity N2, they are likely using the cheap method of a pressure swing absorption unit which gets you to 98%.
i have access to 99.99% N2 for free and have not bothered filling the tires with it. if i get bored i will, but i do not think the benefit is that dramatic for track days.
i think it is all hype, so dealers can charge $75 for N2 tire fills while the nitrogen is uber cheap.
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Stoptech 380mm/355mm | PFC08 / Pagid RS-29 | Akrapovic EVO - CF tips | Benvo Tune | MS UDP | AA air filter | MCS 2-way with 700/1000lb springs | Solid bushings and adjustable links | RD front swaybar | Apex EC-7 18x10 square 275/35-18 NT01 | Turner Race Studs | GT4 Brake Cooling | GT4 Power Steering Cooling | Alekshop Oil Cooler | Performance Steering Wheel | | CF Spoiler | Varis System 1 Full CF Diffuser | Extended Paddle Shifters | Schroth Quick Fit Pro | Turner Steering Rack Stops | Vorshlag Camber Plates
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