JIC, and DC Sports are the only single exit exhausts made for the G35 coupe. there are many made for the Z that can be easily customized to fit on the G too. single exhausts provide weight savings, and sometime better flow. N/A, and boosted cars benefit.

 

Who cares which one is more effective. Give me a break. Which one looks better? Thats the question. We drive a G......not a race car trying to get max hp. Single exhaust on a coupe that already has the 2 cutouts for a dual exhaust looks terrible. How cares how much more "effective" the straighter pipe is? You guys really care about that??????

 

this arguement can go both ways. the people who believe form over function will leave good enough alone. the people who believe function over form will take an already awesome car and make it better for performance reasons.
again, doing something just for looks, and no function doesn't make any sense. could there be a better alternative? definitely. would i get this? nope. does it have a practical purpose? yes. personally, when i make a performance enhancement, i don't care what it looks like.
i do agree that having the two cutouts and only one pipe looks out of place. but that's cosmetic and be overcome by a rear bumper that supports that setup. i'm considering doing the 3" route myself, but it's a little easier for 'us' (sedan) guys. but that's purely for performance... so, to answer your question, i do. i care which is more effective. and i'm obviously not alone.