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Re: FS: Holset HX40, MAP O2 Housing Ext. WG w/recirc, 3" downpipe.
I had a 35 and it wasn't close to enough, I had it at 38psi, and it couldn't keep up with an ancient 3052 car that was at 30psi.
Spool is not that much different but the top end change is huge.
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