Quote:
Originally Posted by svxfiles
With an open or mostly open system behind our engines they, IMHO, sound bad, like an unmuffled garbage truck. 
I have made many free flowing SVX exhaust systems, singles, true duals, ones with an electric cutout and a dump pipe, with cats, without cats, systems with no muffler but five resonators.
There are mufflers now with a built in bypass valve to be mostly open at high flow.
I have not tried that one yet. |
My company sells high end exhaust systems for Porsche, Aston Martin, Ferrari etc. Most of them the owners request an exhaust with a Bypass system. So they can cruze and race with the same exhaust setup.
We made a deal with the German company
www.capristo.de to sell exclusive these `dual` exhaust in the netherlands. The nice thing is, that they developed an electronic control box which controls the open or closing of the valve by the amount of backpressure that is generated. This can be programmed by the owner.
So in comfortmode, it goes open at for example 4.500 rpm. In sport at 2.500 rpm and in race mode....always open.
Normally these valve are controlled in Porsche or Ferrari by the engine ECU, and you cannot decide yourself when it is opened.
Because I own an SVX I have asked the owner of Capristo to make one for me. However they are in the middle of developing a new exhaust for the Ferrari F458. So it will take some time.
Have a look at 997 GT2 exhaust on my webpage:
www.custom-concepts.nl