it all depends on what kind of money you want to spend. With bolt ons (full exhaust, intake, lw crank pulley, and a tune you can make around 160. thats what i have done right now and i dyno'd at 162 whp and 157 wtq.
Now there are some options for us n/a guys that will allow much more power without boost. such as cams, port n polished intake manifold, throttle body spacers, rallitek has completely built cylinder heads available for the n/a's now to include port n polished heads, high lift race cams, and dual spring titanium retainer valvetrain, and now the accessport is available too. with these engine upgrades id say the n/a's could easily make it to the mid 200hp range with no boost.
Like i said its all about the money you're willing to fork out.