dude maybe its more along the lines of

a - maybe some people dont give a shit about gaining an additional 2 nm of torque due to a 2.5" catback and have better things to do than fuck arse around with tryin to gain that bees dick more low down power from what may seem a pointless mod to some...

b - they dont care what other know it alls think & are maybe sick of hearing people who claim to know what theyre talkin about, when it seems they just know how to use google & ctrl c & ctrl v...

c - they're more than happy with the 3" they already have, whether it be a cheap china system or a bloody titanium system that has double overhead foxtails & chrome grease nipples, they're happy havin that smidgin of a disadvantage...

and your right, maybe some here should sell there wrx's & buy 6L holdens if theyre that set in there ways & are chasin that extra torque...