I was reading through this thread because I realized that my DE Y Pipe on my 04 G35x looked similar to the 350z HR Y Pipe but I realized that it's the updated one. My question is that should I get the 350z HR Y pipe or the updated DE pipe is similar to the HR Y pipe ?

 

What about the HR y-pipe from Megan?
~$150-160 delivered.. I tried a ebay normal DE y-pipe and the flex is leaking air after 1.5mths ..... I dont mind 2.5 and 3" as my Fubjitsubo is 3" anyways and i also have HFC which are 2.5" -everything matches..
I should post up video clips of stock cats/ypipe vs stock cats and DE ypipe vs hfc + DE ypipe and then when i get my hr ypipe. If dyno didnt cost so much i could dyno what i get now im swapping DE-ypipe with HR

http://cgi.ebay.com/ebaymotors/ws/eB...%3D1&viewitem=

 

i'm running the new megan HR Y-pipe right now, its prettyyyy niceeee for $150

 

For the OP - the 07-08 G35 sedan Y pipe is 2" at the inlet but it immediately tapers to approx 1.75 in as you can see in your pic. The outlet is similar to the G37 at 2.5"

 

haha i love how this can go on forever, i have tape measure, i have a g37 y pipe, g35 coupe rev up y pipe. i'll measure and post pics for future references

 

I have an 09 370Z HR Y pipe installed on my 04 G35x, Inlet is 1.75" out is 2.5". I haven't lost any power I also have AAM Competition HFCs. I am waiting to install an exhaust within the next couple weeks. There is no longer any rasp associated with my HFCs. Sound is smooth.