20.5? In a TUNDRA?
Are you sure you have a Tundra? Mine with K & N Drop-In, Tornado Air, and Flowmaster muffler has yet to get over 13.5. I was very disappointed with my mods.
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Sold - 02 Tundra V8 TRD I.S.
Flowmaster, K&N, Etc.
Now beating myself up over my 05 GMC Z71 
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