Perry Casson wrote:

Using the Spintech part # system as defined  by
http://www.spintechmufflers.com/spintech/styleimages/index.htm
Are you going to be making  #9137 or #9139?  From what I've read if you

do

not use collector as in #9139 has you loose virtually all gains from
attempting to build a tuned exhaust.

Perry Casson

Peter Cowan wrote:

Also, Perry, what is a 9xxx? I don't see 9 in their sound level options.
Count me in for a xxx1(I'm open to pipe size).
Peter

Part #9139 is the part # written on my muffler that I had spintech build.
On closer inpection the first 9 is probably supposed to be a 3 (85-90 dB)
As for the importance of having a collector, if you do not have one I think
you should double the length of exhaust pipes from approx 31" to 62"
for our target RPM. My thinking was the integrated collector was the
best option for a compact exhaust.  I think it was an extra $100 to get
them to build the collector version.

Perry

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