Exar's best TK feat is either killing an old Odan-Urr, or hurling Sylvar - both of which pales in comparison to Revan's showings. However, he's canonically more powerful than Ludo Kressh, who shattered a giant stone statue just by clenching his fist. In fact, by quotes, he's more powerful than Ragnos/Sadow, who are more powerful than Kressh.
Also, in SOR, his spirit TK's the player back.