5.0 Magazine just did a Trick Flow top end kit on a almost stock 5.0 Mustang. It had over 100,000 miles, a cold air intake, headers, off-road 2.5" exhaust, and that's it! They added the Trick Flow top end kit with 24 lbs injectors & matching Mass Air Meter. It made 219 hp to the wheels stock & 312 hp after the Trick Flow kit, without a tune! That's a pretty good bang for your buck!