How much rwhp and rwtq do STOCK LT1's make. With longtubes, ypipe, exhaust cut out, flowmaster muffler, 160 thermo and tune how much do you guys think they will pull to the wheels and torque. Just curious any help would be appreciated. I know there is no exact way of finding out other then dyno but what experiences have you guys had.

 

This might help you out:

http://ws6.com/mycar.htm

You can't really stack the dyno numbers from each part on top of each other, but it should give some idea. Fill in your location as that will have some effect as well.