Front parking sensors
I installed the "Cure for the comon curb" sensor on my 06 XLR last summer and it worked great until I had a 'Head-on' with a Raccoon in OK. on my way to NHC last year, that took out half of my lower grill.
After repairing my baby last year, I reinstalled the sensor and it works great again.
The only thing you have to be careful about is it only beeps once and if you have your radio to loud you may miss it's beep!
I've been thinking of adding a flashing LED to it.