I was going to suggest a gear change.But I see you already have done that. As has been said, the BBK throttle body is well worth the effort. And a decent set of headers may not improve the low end, but the revs come up so quickly especially with your 3:73's that the power they make is felt almost instantly , when you open up the throttle. As long as you keep the fact in mind that it is not a V8, and will never make that kind of torque, the usual mods will work wonders.
2011 GT. Grabber Blue. Procharged. 3:73 manual.Billit LCA's. Corsa Extremes. GT 500 wheels. Racemaster DR's. T-56 Tremec. Dynotech DS . Centerforce DF. American Racing headers/high flow cats 560 rwhp.Donny Walsh tuned
2012 Pony Package. Race Red.3:31 automatic.BBK longtubes and catted X.FRPP Sport axlebacks. BBK throttle body. Dynotech DS. Brembo wheels and tires. Strut tower brace. Airraid CAI. Bama tuned.