Originally Posted by cjracer
The RC8 Stack or "Trumpet" as KTM calls it is shorter than the 990 ADV ones.
Thinking is that the shorter stack should let it more air for higher HP#s.
The Longer 990 ADv ones result in more torque.
These will be here soon for testing.
Air filters just showed up so I hope to start shipping out Fri and Sat.
The orginal stacks for the 990 motor (Adv,superduke,SM/T/R) are the same
The RC8 stacks with 2nd flies removed used in a airbox should give a gain starting from 6500rpm till limiter.
But it doesn't loose torque down below.
And the fun part is they cost allmost nothing, i paided 5 euro (6-7 US dollars).
example from a superduke: