the first drive on any hardware change is always the most important. as i mentioned, i put my stock downpipe back on late last night, and flashed back to Unitronic Stage 1+. (yes 93 octane on 91 gas, ill log the timing pull when i get a chance, should be fine.)
the first difference i noticed this morning was better throttle response from a dead stop. didnt notice much else yet. but there is a 1/2 second less throttle lag from a stop with that tight stock downpipe. but im probably losing at least 20 tq in my low to midrange from what all the history has shown.