I am running them. Although I did not dyno the car, I can tell the difference in both the bottom end and the sound.

My brother also drove my car a week after I had them installed. He lives away in Indiana. He borrowed my car to take a ride to meet some friends, and I didn't tell him about the headers. He came back and asked me what I did to the car, saying that it pulled harder.

99 E1 SVT Black/Tan, MSDS Headers, SHO-Shop Y, BAT Intake, Opt. TB, UR Clutch/Flywheel, Quaife, B&M, Konis, GC Coilovers, Pulley, Mintex Pads, 17" MAS Italy Rogers, Nitto 215/45/17, Portmatch, 138K