exhaust / bypass - which one to choose?
03-27-2015, 01:29 PM
#46
Race Director
What does any one know about the Bypass Pipe Set by Cargraphic? Does this just Bypass OEM Side mufflers but maintains the OEM rear? Does the PSE button still function? How does it sound?
03-27-2015, 02:24 PM
#47
Their site states center muffler is stock Porsche and Bypass keeps PSE button. I want to keep center stock muffler to not compromise any possible aero benefits
03-27-2015, 02:32 PM
#49
RL Community Team
Rennlist Member
Rennlist Member
03-27-2015, 02:39 PM
#50
Former Vendor
I had the shark werks center muffler bypass on my 997.2 and LOVED it. Naturally I went with the same choice on my 991. I also have my valve bypassed.
Sounds Excellent at WOT and docile at cruise. Highly recommended.
Sounds Excellent at WOT and docile at cruise. Highly recommended.
03-27-2015, 03:32 PM
#51
Rennlist Member
Akra is making the same claim of 20 hp on their Evolution Race setup, but it occurs at 3,950 RPM and 11 hp increase in peak hp at 8,000. I'm assuming there is some inefficiency in the stock setup that they both correct + the valves being gone.
I don't know exactly when stock valves open, but I thought it was 4,000? It seems to make some sense that the biggest delta without the valves is right before they would normally open.
I don't know exactly when stock valves open, but I thought it was 4,000? It seems to make some sense that the biggest delta without the valves is right before they would normally open.
03-27-2015, 05:01 PM
#53
what kind of video do you need? I currently have their rear muffler bypass and will soon receive the side muffler bypass with valves that works with the PSE button.
03-27-2015, 05:05 PM
#54
Race Director
So will you be reinstalling the OEM rear muffler with their side deletes- I am trying to figure this out?
03-27-2015, 05:06 PM
#55
03-27-2015, 05:13 PM
#56
I know what they are, they have valves like oem, and they work with the pse button. they can be used in conjunction with oem rear muffler. when the valves are closed the exhaust is routed to the upper section of the rear muffler and thus the sound is muffled. they work as bypass when the valves are opened that route the exhaust to the lower section of the rear muffler, so it will work like the bbi when the valves are opened. I believe they will sound like the bbi when the valves are opened because oem headers and oem rear mufflers are still in place.
03-27-2015, 05:13 PM
#57
03-27-2015, 05:14 PM
#58
A video similar to this would not be bad at all
Video Link: https://youtu.be/3xcSUIeYqwU
Video Link: https://youtu.be/3xcSUIeYqwU
03-27-2015, 05:29 PM
#59
Race Director
03-27-2015, 05:30 PM
#60
Akra is making the same claim of 20 hp on their Evolution Race setup, but it occurs at 3,950 RPM and 11 hp increase in peak hp at 8,000. I'm assuming there is some inefficiency in the stock setup that they both correct + the valves being gone. I don't know exactly when stock valves open, but I thought it was 4,000? It seems to make some sense that the biggest delta without the valves is right before they would normally open.
can he elaborate on his claim? where is the dip and how can the parallel flowing flap create that dip? with that said, will header cut out make the most power in the whole rpm range?