TBI spacer

Looking to see if anyone out there has experience using TBI spacers, I am looking into installing the version from CFM-Tech. Wondering if there are significant improvements in horsepower and most importantly gas mileage. I own a 95 Yukon with the 5.7 litre.

Hi, don't waste your money.
Somebody had a thread on this.
Take care, Eggert :bananasmi