Originally posted by "Someone"
PHP 2-Valve Intake Spacer (Fits 1996-2002) - The PHP Intake Spacer is a fast and easy was to gain 5-7 horsepower & torque. The intake Spacer allows a straighter flow of air into the intake. It may seem simple but it works!
Cost: $199
they say 5-7 hp but 5.0 Mag. just tested it and picked up 11.2 rwhp off of it with minor bolt ons.
http://www.paulshp.com/paulshp.htm