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Ok, the WW does not stop surge only because it moves less air, it's "MAP" is different. The RPM it could surge at IIRC. Also with the staggerd blades it can spool quicker, and only moves SLIGHTLY less air, not much for sure.
The ATS does not make any more whistle than a stock housing does I don't think. Infact with my stock wheel on I have virtually no whistle now. (Man I miss it too, I had an early 99, and had the ww on my last turbo on here.) But when it went out, my new center section came with a stock wheel, and my ww was damaged slightly. The ATS stops surge and stall because of the PORTED housing.
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Jim T.*48* SLAPS Co-Founder, 30.8 yrs RETIRED UAW 6/01/06, Now an ART (Specialists Flight Chief) with the USAFR 414th MXS Seymour Johnson AFB. My pics! '03 Dually pics!, New truck, 2011 F-350 SRW LB CC. White Platinum Lariat! 4x4
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