I use on and it works great. I used it in the fuel line though. It helps to build fuel PSI thus giving me more gas quicker. I'm thinking of putting one in my exhaust to increase exhaust speed so the propulsion system will work better.
98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)
FS: SVT rear sway bar
WTB: Very cheap beater
CEG Dragon Run - October 13-15