@
KoolBRZ sumarized really well. Btw, I have a MT with EL headers, full exhaust and tuned. I can HEAR the difference when there's different weather (specially going from not only from wet/dry but hot/cold), but as you say, I cannot feel the difference on the butt dyno. I think I have been lucky enough to drive manual most of my life (since I was 16 in fact) and usually cars with worse trannies so I have luckily never miss shifted, on upshifts nor downshifts (i sux at rev matching tho, thats a story for another day).