Originally Posted by GCLimited
None of the above.
Radar Detector - Just about useless in areas that use laser (LIDAR). You'd be better off with a jammer.
Axel Back Exhaust - Noise maker only, no HP gain...if anything you lose low-end torque. You own an SUV, not a race car.
Engine Tune - Depends...I hope you're not talking some garbage chip. A custom "Protune" on a dyno is the only worth while engine tune.
Personally I'd bank that $500 towards your next set of tires.
Radar detectors are not useless in the wide open areas of Texas.
Yes I own a SUV but that doesn't mean it has to sound like a Priuis.
Hemifever tune if that is suitable with you.