What benefits would I gain by switching my setup from a single bar map sensor to a 2?

I currently have a 95 Z with the stock PCM (single bar map sensor). From what I understand if I were to upgrade to a 2 bar map sensor, it would be easier for my dyno tuner to re-tune my supercharged Z in my sig, plus, it would probably run better. I am aware that ultimatly a complete FAST system would be ideal, but don't really want to spend the $ involved with that.

My question is, what exactly is involved with switching to a 2 bar map sensor? I am not even sure where it is located in my car. Can I just go to GM and order one for $40?, and then install it right before I have my car dyno tuned?

The MAP sensor on the LT1 is on the top of the intake manifold. It's a small black rectanglar piece bolted to the intake and has a 3 wire connector.

Yes, all you need to do is swap the MAP sensor with a 2bar unit (are those available at GM?) But, your dyno shop must know how to do 2bar PCM programs, also.

I'm sure they do, but I'll inquire with my tuner tomarrow. So, switching the little black rectangular piece is all that is needed past tuning??

From what I understand they are available through GM for like $40. Does anyone have any more info on this as well?

I know you can buy aftermarket 2bar MAP sensors. I noticed in the most recent Summit catalog that MSD offers them. I suppose the factory might have used them in factory-supercharged vehicles.

I've heard of a lot of people trying to tune those and not being able to figure it out. It's not as easy as it sounds to tune.

And after I talked to my tuner, he concerred with Sweetred95ta's thoughts. Looks like I'll be staying where I am.