I've heard that those types of strut bars actually hinder handling and are bad for the struts because of how they mount. You should have gotten one that bolts to the nut on the strut tower itself.

2006 Pontiac G6 3900SFI GTP Coupe CAI, Stainless Cat Back, Vector Tune, Strut Brace, Eibach Pro Kit, Custom Made Projector Headlights, 4300K, 20% Tint Former Owner- 2000 "Stryped" CSVT CEG Dragon Run- Oct 13-15