Shaman
Well-known member
lol Well, that's what they are making on multiple Dynojets, who knows what it makes on the CSBK dyno. Certainly not I.
Here's a setup right from Akrapovic's web site:
one from EDR with pipe + PCV tune, bottom line is stock race ecu results, top line is with U4.4 and richer tune using the PCV (got 5hp, whoopee)
If I had to I could find others, as I have seen now about 10 of these with pretty much the same results - with slip-on it's around the same output as the stock headers are essentially copies of the Akrapovic evo2 header with very little improvement to be seen in a full system, a few horsepower probably just because of the minimal restriction of the open exhaust valve (race ECU turns off monitoring the valve, and then you lock-wire it open so the spring can't be overwhelmed at high RPM when you remove the servo motor).
Some have claimed 197whp with full system + race filter + tuning. I'm a bit skeptical.
Here's a setup right from Akrapovic's web site:

one from EDR with pipe + PCV tune, bottom line is stock race ecu results, top line is with U4.4 and richer tune using the PCV (got 5hp, whoopee)

If I had to I could find others, as I have seen now about 10 of these with pretty much the same results - with slip-on it's around the same output as the stock headers are essentially copies of the Akrapovic evo2 header with very little improvement to be seen in a full system, a few horsepower probably just because of the minimal restriction of the open exhaust valve (race ECU turns off monitoring the valve, and then you lock-wire it open so the spring can't be overwhelmed at high RPM when you remove the servo motor).
Some have claimed 197whp with full system + race filter + tuning. I'm a bit skeptical.
Last edited: