To put it simply, without a before and after dyno, there is no way to know if the change added any power.
That is why I dyno tested my new exhaust and if you look at the data, you'll see that the hp increase is very small (7hp) and ONLY at certain RPM's (only above 5800 rpm). This info was different than what some people were reporting based on the good ol' butt dyno. I'm not saying that the butt dyno doesn't work, just saying that it is somewhat subjective.
http://986forum.com/forums/general-discussions/51783-top-speed-pro-1-catback-exhaust-hp-increase.html
Soon, I will also be posting a before and after dyno test of my old 136,000 mile engine and my completely rebuilt engine so we can see what, if any, difference there is in power between an old tired motor and a new rebuild.
Threaded Mode
