Just for amusement i will throw 15-18 discs on, and cut my end cap. I will report my findings. I will in fact, be a man and apologize for the disbelief if this fixes my issue. 👍🏻

AFAIK, there has only been one Street Tuner.
I suggest you start with the closed end cap. Then bored a 1” hole, then 1 1/2” hole, then no end cap.
This will give you an idea of how exhaust restriction changes engine run quality at lower rpms @ light throttle.
Please share with us know what you experience.
Thanks,
Bob
Disclaimer: The above assumes an otherwise properly tuned engine.

thanks, i will try that

Installed 18 discs and closed end cap...HUGE restriction on performance!

Did you tune for the change?

I thought this was a test to see how the bike ran in the problem area?
Define HUGE restriction on performance.
You know, the more we converse the more I believe you may be better served to get it done by a good dyno tuner and get on with riding?
Bob

[QUOTE
I never claimed to be a tuner or an expert...thats why I’m here. I want to learn.

I did infact take it to a “tuner”, and twice he couldnt tune it properly nor figure out why it wasnt 100%. There are only 2 dynos within 3 hours of me, my choices of tuners are very slim. 3 trips/3 wasted days when i could have been working, for a tune that didnt pan out. I also didnt feel comfortable revving my bike to 4000-5000 when I could tell it was hugely restricted. Call me cautious or stupid, I guess.

But on another note, i guess i owe an apology. Cut a 1.25” hole in end cap, and I can NOT get the bike to sputter @ 1/4 throttle(4000-5000rpm). Feels like I may have even gained some torque on the bottom end, but def lost on the top end. Now time to call the tuner and tell him the findings. So thank u guys for the help thus far.

Should i bore it to 1.5”, add a couple more discs, or leave it and see how it performs on a dyno first?

great idea. Got my powervision now, i could try my hand at that too. Any idea if I can save the current map on my new PV. The map on the bike now is from another PV(tuner bought another licence to do it)