My Cougar also runs lean with my combination of modifications...and I am also getting 19lb injectors to compensate for this.
I've logged my car a bit and I find it actually only runs lean at or near WOT. Seems the PCM can keep up for anything else...
This seems to make sense for any non-SVT engine with bolt-on modifications, intakes, gutted precats, SVT UIM/TB. Ford would not have spent the money on 19lb injectors if it didn't have to to produce the extra HP out of an SVT engine. So if your dynoing anything above probably 185 fwhp (close enough to early SVT 192fwhp) than 19lb injectors are probably a good thing. And +15HP is not unresonable with a few bolts ons...
