I replaced mine as well....I changed to a 14" round, 3" tall K&N....it cost me nearly two tenths of a second in the quarter mile and almost a half-mile per gallon fuel mileage.
Looks like Roush knew what they were doing with mine!
Hope you have better luck.
__________________
Roush #1
Lone Star Classics
Roush Edition #01
Roush 427 SR #444
|