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New RPi ST Exhaust System: Open house testing

2K views 9 replies 6 participants last post by  Ahmed 
#1 ·
Ok ok, so I have started the ST project up again. We are now working on the ST version of our exhaust. The internals of the muffler are a little different and we are adding an external cap to the front section of the muffler to bring sound down. This will be a limited production item so for those who are interested in it, let us know using this thread so I can have an idea of how many I am going to make. During the testing stages we will still allow our "open house" testing so you guys can hear and see the system. For more information please contact us at 562-630-5966. After testing, production takes about 4-6 weeks.
 
#6 ·
The ST means "sissy treatment"..lol. jk. Its for StreeT. We changed the internals of the mufflers to have a mixing chamber that extends to the front of the muffler. This design will reduce drone. I am doing some sound testing for the next few days to see how much the sound is changed. Dynos to come.........if the sound is brought down.

Do I need to inform you that I may be interested Eloy ;)

What do you mean exactly by you are adding an external cap to the front section of the muffler? Can explain to us more about this system please?
If this design works, Ill post some pics of our prototype. I'll know when I drive the car around the next couple of days.

is this going to be louder or quieter than the GT?
Loudness is about the same but a little more quiet. The purpose of the new design was to bring the drone down. From our past tests, this does reduce the power. We came up with a new design that "should" perform well but this is all speculation until we actually dyno test it. You will never get anything for your m5 from RPi that is based on speculation. :)
 
#3 ·
Do I need to inform you that I may be interested Eloy ;)

What do you mean exactly by you are adding an external cap to the front section of the muffler? Can explain to us more about this system please?
 
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