China has a lot lower standards then the US though, lets be 100% real. thats the main reason i was scared over to Kooks, made in the USA, with USA quality standards.
I haven't had any issues what so ever, before or after tune. I rode the car around for about a week and a half without a tune, then obviously took it to Steeda and since then my Gas mileage got better when i don't drive crazy lol.
I've yet to have any issue of stink lol. Seriously though besides the fact that it sounds and performs like a beast, theres no negative effects from going cat-less.
installing the back springs are a joke, should have BOTH sides done within 35 mins its that easy. Front is only hard because you have to compress the springs, taking the car apart to get to the strut took me only 8 mins max. i wouldn't want to pay more then $250, its not that damn hard but then...