just installed new 2-1 supermeg with closed end cap & 20 discs sounds good maybe a little quiet but its raining here so cant take it for a run . could anyone tell me what it would sound like with open cap & 12 discs. i had a thunder header on before but on the highway after a 100 miles i had a headache. how does it compare to the thunderheader with an open cap? thanks BUTCH FIRST POST GREATINGS TO ALL

 

bxbutch,

did you ever adjust the discs? If so, to what?

My info is that you start with a rich mix by using 12-14 discs and read the color for further refinement, usually adding to about 14-15. The Open end cap counts as 10 discs according to Supertrapp cusotmer service. The open end cap is necessary for dyno tuning. Heard anything different?

 

17 discs/closed is a good place to start, that is equal to 99% flow
9 discs/open is equal to 99% flow also.

Open endcap is equal to 8 discs, but also acts differently. Your bottom end will normally suffer a bit by using it as there is less back-pressure.

I didn't like the sound of the open endcap, just too raspy and loud for me. I'm running 17/closed right now and it's running great.

All my info comes from the former Supertrapp R&D guy that developed the current Supertrapp years ago.

 

thanks maineultra.

Was concerned about the dynoing w/the SERT. Not sure if the tech will play the extra disc variable. Your response and the Supertrapp rep seem to put me in the neighborhood ( 10 discs plus end cap?). Only got the open end cap 'cuz the dyno folks said they needed the opening. Like you, will probably add 7-8 discs and close it up.

 

Buy a spare end cap and let them drill the present closed end cap. I just had mine on the dyno and let the tech drill 2 holes so he could put both his sniffers in the pipes.

 

msocko3,

how many discs did you end up with after the dyno?

 

18 with the closed end cap.