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basically, unless you're installing a MAF for a much higher air flow rate than factory, yes. It would be pointless.
My LS6 MAF is because it will accomodate a much higher resolution at the flow rate that pumps through that massive turbo.
"High-flow" maf's would only benefit you if you were pushing a serious N/A build or a boosted setup.
CAT's - My recommendation would be a CATCO with stainless core, not ceramic. Make sure you order one at the same diameter as your cat-back, not stock size. Cats already restrict flow as it is, and if you go 2.5" catback system with a 2.5 high flow, then you'll be ready for it when you upgrade to headers.
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