if you figure you make about 175 whp stock, you'll probably see around 200 whp, mostly due to the y pipe.
if you look here:
http://www.motorvate.ca/mvp.php/504
it shows gains as high as 30 hp in some areas on a stock 95 5 speed from just a y pipe, it gives an extra 15-20 ft-lbs of tq too. best bang for your buck you can get on a 4th gen. it's worth every penny.