i'm on race and initally felt it was loud but kinda gotten used to it, can easily have conversation and use blue tooth as well.
in cabin sound is definitely bearable but it is loud if you are outside, lets juz say tt wen u WOT, ppl will look @ 6 pot + so called "race" exos
before the aisayman race, my performance filter was loud and filled the cabin with sweet sound when loading at 3k onwards.
but now the sound comes from the back and muffles the filter and engine sound to a certain extend.
droning is not bad, u gotta get use to moderating the throttle and getting gears right to compensate droning.
anyway its a sports muffler for God sake, if got no sound then why change it.
the sport and race diff shld be the following(if memory serves me right), sport 3db louder than stock and race 8 db louder than stock.
low end wil suffer so u may need a performance filter, power box, throttle controller to compensate.
but once u hit 3k+ above, sweet and it still pulls at 6-7k range whereas for stock this is a dead zone.
so jist of it, shld be sufficient for u guys to decide to buy or not... ENJOY