do they work?anybody using with stock tb?

They worked on the jeep inline motor's, AEM got 2 hp on the 4.0 and 2 hp on the 2.5 when used with thier cai. Thier cai includes thw spacer, AEM does not include a spacer with thier liberty 3.7 kit, so that means no gains to be had on that motor. There's very few efi engines that benifit from a tb spacer, more so on carbed engines. However, I used the airaid spacer and a 4.0 tb on my 95 yj with noticable results, I've tried them on other engines with nothing but a whistle. AEM does the work for you, if thier cai comes with a spacer, then there was some benifit found, no spacer, no benifit.

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06 jeep liberty 4x4 65th aniver edition

04 ranger xlt sc 4x4, 4.0 sohc, 5-speed, gibson dual sport, cai, udp, bama tune, BFG's, and tru-trac

07 redfire mustang GT, 4.6 3V, 5-speed