I just got my RSR exhaust which is yet to be installed. Wondering if anyone knows how long the extension piece has to be between the mid-pipe and y-pipe (since its going on g35 coupe). I need exact length b/c i plan on putting flanges on the extension piece. I was told probably 10" by RSR themselves (but guy wasn't 100% sure- and i dont have room for mistake).
Also, does the qaulity on extension piece matter, i just don't want the tone of the exhaust to be effected by this piece.