tork cones

[tmworks]

hi all, after replacing my stock exhaust system( they broke in half) with Jardine 4 into 1's the usual happened. Poor performance.
Before I take my bike down to have it dyno tuned I am curious as to whether any body has tried to ether lengthen the pipes or used “tork cones” to regain the lost performance.

[81xsproject]

Did you re-jet for the 4-1? You could also do like Maximan and get some Supertrapp baffles and disks to relicate the back pressure of the stock exhaust.

[tmworks]

I havn't rejeted yet. I was just tring to preserve my fuel milage.
Thanks for your reply