I recently purchased an xo2 exhaust for an G35 coupe and have different length extension pipes. I have tried everything to get this system to seal but have had no luck. I called the vender and had 2 more pipes sented but the new pipes were cut the same as the first set. Has anybody else experienced the same problem?

 

You need exhaust spacers to fit a Z exhaust on a G35. Take it to an exhaust shop if all else fails and have them weld some up. It's easy...

 

^ the X02 comes with g35 extension pipes, dont know why it shouldnt fit. He's having fitment issues.
My cousin got the same exaust on his Z put on about a week or so ago, fit was SPOT on!

 

The extension pipes are the problem. They are two different lengths which bolt to flanges that connect the left and right side pipe together. The driver side will seal but the other side will not. I had the vendor send two new extensions but they were cut the same lengths.

 

I didn't pay any attention to the g35 extension pipes but would it maybe be that you're putting in at the wrong section? or maybe you could mix-n-match the extension pipes. use the one that worked from the first set and the one that works from the second set.