LOL
There is so much to the mechanics of these little monsters that can be done to improve performance that it is mind bending to say the least!
Max, you don't need to defend yourself !! You know what's going on!
Let them find out for themselves , as most posting are new and DON'T know!
99% usually ruin these good engines by running them too lean/or rich and not keeping the dirt out ,because they don't know the proper way to prep their air filters.
As producing "these special mods" is quite easy with a milling machine, no automation needed, you are paying someone for the time it took them to put the sleeve in the machine and mill it.
A true modded engine needs the crank ground and polished internally, timing reground into it(precisely) and a 5 axis cnc mill to rework the sleeves !!
not many people have a $200,000.00 milling machine nevermind the knowledge to program it, and a grinding machine for the cranks !
So folks, keep paying an extra $100 + for these mods or send your engine to only a few guys that REALLY know!!
MAximo and Andy Brown are the only ones I know of that truely spend the quality time to do it correctly. And I think AB has the grinding stuff, just not the 5 axis cnc (Yet lol)