I have the Nismo 350Z exhaust with the 6" extension. I also had the tips extended 2.5" and it fits perfect. Also this is made by Weldina. It's the same exhaust as the G36 JDM version. The only difference is the application and $1100.

 

speeder did you get the tips extended b4 or after you put the exhaust on your car. i just bought the nismo cat-back but didnt put it on yet.

 

I put it on first to see how it looked. Then measured and had it extended with TIG welding and stainless extensions. It looks awesome!