Steed pullies vs. cnl upper plenum

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It would be close, based on the claims of the manufacturers. The plenum with the OEM TB is worth about 5 rhwp and probably about the same for the pulleys. Plenum is a heck of alot easier to install though, and doesn't require an air wrench (pulley swap does). So there's my 2 cents - plenum! Check www.modulardepot.com - and see their plenum shootout, parts 1 and 2...good stuff!