RED is the Pro-M 77
GREEN is the stock MAF with a K&N and the air silencer removed.
A quick glance at the numbers:
Stock: 220.8 rear wheel horsepower 264.1 ft-lbs of torque at the wheels
Pro-M 77 235.0 rwhp (+14.2hp) 280.6 rw ft-lbs (+16.5ft-lbs)
Pro-M 75mm Bullet 238.4 rwhp (+17.6hp) 284.8 rw ft-lbs (+20.7 ft-lbs)
WINNER: PRO-M 75MM BULLET It sported the best numbers by a minimal margin, but it costs half of the price of a Pro-M 77.
With a larger MAF and air filter, bumped timing, and shorty headers, my car is making the factory flywheel rating at the drive wheels. While these numbers will not win a major NMRA drag race, they are impressive in illustrating how easy it is to make substantial gains on a 94 or 95 5.0 Cobra with minimal cash invested.
Of note:
The Pro-M 75mm Bullet is not a replacement one. It does not fit in the stock airbox, and requires the use of a CAI.
The Pro-M 77 was forced to breathe through the stock air 'S' turn intake hose. Due to it's size, I was unable to make a suitable CAI for the 77.
The Pro-M Bullet is shown at Pro-Flow's web site.
Model 75mm94-5C
Serial 00a4435
CAL 19C
Also, you'll need to build a CAI like I did, with directions listed here.
Good luck!