Join Date: Apr 2012
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Actually, the most power is achieved when running ever so slightly lean but that is tuned in and not achieved just by throwing on a pipe.
Anything that you do that changes the way the engine runs be it before (intake), after (exhaust), or inside the engine, should be changed in the fuel map as the factory map does not cover most of the rev range.
There is a feedback loop for idle to keep that within spec, but it does not autotune for the entire RPM range.
It is true that you will see hotter temperatures and CAN damage your valves/head in extreme cases but that requires significant changes to the engine without tuning to cause damage.
Running a slip-on with stock ECU is workable, but I don't recommend it.
I rebuild carbs for a living, granted, off older motorcycles but the tuning aspects are still the same, it's better to be slightly rich rather than lean.
'06 in Silver: 29K on the clock (and counting)
PCIII w/custom tune (stock AF and shortie stacks)
320mm rotors with SBK5 pads, Galfer HH rear
Full f/r FenTubo Type 2 set black on black
Nissin Radial M/C (07+)
wrapped in Mich Power Pures (aka love)