For one thing the OEM exhaust is one piece, it has no point to separate muffler from collector.
As for changing the outlet shape on add-on tip, it will increase the velocity the gas's leaving the muffler but do very little to actually make more back pressure that effects HP engine is making.
Because the Remus has such a large collector down stream of head pipes and a large volume muffler section it together is like a big surge chamber absorbing the flow by raising it internal pressure ever so slightly.
I get to hear what the outflow of gas's sounds like when up against a cement freeway partition at speed .... more a whoosh sound than a roar.
** Best part is your only fooling around with a replaceable insert that costs squat .... before you say it's too restrictive, try it and come to an educated first hand account of what it does for noise & power
What this shape idea is based upon is simple sound wave energy dynamics. A sound wave leaving a round hole travels outward like a donut, think a man blowing cigarette smoke rings.
The bent outlet prevents this donut shape sound wave breaking the pulse energy into 3 parts of unequal amplitude .... what you hear no longer has a crisp pop pop to it.
Other pictures are muffer tips I use on ALL my race boat exhausts and been doing so for years practicing the idea of breaking up the shape of the sound wave has been proven to work.
Originally Posted by stevea2980
So restricting the airflow further doesnt present any problems??
If a reduction in airflow is helping with the noise without a penalty in power I wonder what putting on the stock muffler would do? You would still have the chip and headers.....