A gq wagon stock in good nick will make about 70-75 hp at the wheels. I know this as I asked various mechanics while I was getting quotes for my turbo install and saw their dyno shets of other customers. Before I turbo'd mine I had extractors, 2.5 inch exhaust, snorkle, k&n filter and a pump tune I made ( dyno proven) 88hp at the wheels. these little mods are good for about 15 hp. Its not alot granted but its near 20% increase in power, which is noticeable