Better to spend money on aftermarket MAF sensor, will try to find brand for ya and A cold air intake. Then go to exhaust. If still not satisfied squeeze in the air with a magna charger. A tb spacer will not help (noticably) in performance or milage on the 6l but could be added to help with other mods but personaly and from talking to customers was a waste of money. Just mine and a few others opinions.
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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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