Is there any difference between a genaric 3 bar map sensor and a gm 3 bar? Or MSD? Just trying to figure out if it's worth spending the extra on a GM piece or not. I have been checking out the 3 bars on Ebay with the pigtail and 3 year warranty for a decent price.

 

Most of them are the same sensor just repackaged. I always test the sensors with a regulator and scanner to make sure they are working properly.