Originally Posted by ///MbmC
///M1, unfortunately, I didn't do any pre and post dyno runs. The butt likes it anyhow.
It really does sound great. And I've been told it sounds even better on a drive by! I drive with the valves open mostly, except when I'm pulling into my neighbourhood at night.
If my results are any indication, you picked up about 10whp / 8wtq. And these results were dynoing the car straight off the lift, without any adaptation, so it is perhaps higher (with the valves closed it was still a gain, but about 2-3whp/wtq less than with the valves open). I'll play with the Dynojet WinPep software and post a graph shortly showing the true delta
2011 BMW E82 1///M: AW, all options; Renntech, Akrapovic, Forge, P3, RevoZ CF bits, many mods
1988 BMW E30 M3: Hennarot, S14, stock
2016 Porsche 981 GT4: Guards Red, LWBS, SC, full leather
1998 Porsche 993 C4S: Zenith Blue, last aircooled widebody, Bilstein PSS10, Fister II + Fabspeed exhaust
2008 Audi B7 RS 4: Sprint Blue, Audi Exclusive Euro Bucket Interior, Premium+Titanium, many mods