replied to the thread E46 M3 S54 headers
" [QUOTE=onurleft;522413]I've seen a back to back dyno of SSV2, same dyno, same day vs. the Epic headers. The Epic header made 1-2 more peak hp and about 2-4 ft/lbs all the way across.
The test car was an unopened S54's that made 350whp NA with the SSV2 headers. These cars had carbon plenum's, pullies, lightened flywheels and 3.5" exhaust.
On this same dyno, my car (Carbon airbox), and SS "rep" headers made 304whp (in part due to a crappy mid pipe at the time).
The key to Epic headers, is Epic dyno tuning. Nobody has won with the S54 in BMW CCA and NASA club racing more than Epic. Their research is a result of their racing experience, and frankly, it's more like racing dominance if you check the standings. Their partnered with Bimmerworld in Club/Endurance/sprint racing. "
Today, 11:35 PM