Ah, thanks tiguy for the quick response.

I've only 27k miles in socal weather, so I'm sure reusing my sedan gaskets won't be a problem.

Rev up airbox, you're next!

 

You could use your originals.. but for as cheap as they are, I'd replace them, the sedan ones are what you want to get..

(actually, they're probably the SAME gasket, they ALL come in NISSAN parts bags... just NISSAN and INFINITI specific part numbers!)

 

Bring it on haha

Either way you're fine though. If you can grab some for 4.00 like the link ^ ^ I'd say go for it since they're so cheap. Just make sure they're either the OEM ones or exactly the same so they won't cause any leaks

 

Today I finally went to go get my coupe midpipe installed and possibly the HR y-pipe that I picked up. Ended up getting only the midpipe put on because as I said/suspected before, the midpipe that was on there looked identical (in shape and size anyway) to the HR that I got off a g37. You can see that there is no way that the stock DE pipe that Dave posted on page 1 could fit here. The piping diameter was also the same, at least at the single outlet pipe.

G37 HR y-pipe:



2004 G35x stock y-pipe:






The coupe middy/HKS combo/HR-ish y-pipe that I now have is not as loud as I had expected, but maybe that's because the midpipe sat in my living room for a few weeks and the anticipation ruined the end result.

Can anyone offer a logical reason as to why the HR would be any better than my stock y-pipe? I'm just stumped when it comes to why Infiniti chose to put this pipe on AWD versions only if it supports better flow like everyone says it does.

Looks like I may have a y-pipe for sale shortly...

 

dibs on your y-pipe!!!!

 

My 2004 Gx has the same exact pipe... it looks just like DaveB's HR Y-Pipe, but WITHOUT the hockey pucks... it confused the heck outta me also in trying to identify WHAT pipe this was supposed to be...?!?

The dealer actually replaced my original y-pipe which was the DE "T"-pipe.. with this version.. which they insist is the pipe for the Gx... late 04??

I got nothin'... but it sounds good though.. I noticed a difference after I got the car back from the shop, but didn't think anything about it... long after the fact I was under the car and and had an "OH-S**T" moment when I saw the pipe that was installed!! It made sense why the car had a deeper sound to it.. I had the Y-pipe installed.. and didn't even KNOW!!

 

Thanks for the analysis and photos, it is good to know that I already have this HR style Y pipe, one less thing I have to look for.

 

sunofabitch they are the same. huh

 

Has anyone done this mod on an 05 REVUP coupe?

 

Interesting. Did you actually measure the outlet size? I'd like to know actually. Thanks. Great info.

 

So why would Ricog35x be noticing any gains? Seems he replaced it with an identical unit?

 

Did he end up installing one? All I remember is him saying something about the rev up air box.

And about the measurements, I don't have a ruler handy, but the gasket from the HR pipe was a perfect fit for my stocker. I will take an actual measurement once I find a ruler.

 

Also, today I realized how much I love the sound of the y-pipe, coupe mid and HKS. I think I just talked myself into thinking it would be "oh ****" loud, which obviously it isn't. But I looooove the new sound

 

To this day I still have not heard the HKS in person. Maybe at a meet this summer ill get to hear one. Im thinking of grabbing the new motordyne setup in the summer.

 

I believe this was discussed before already, the ypipe on AWD is very close to the 350z HR ypipe because it needs the extra room up front to clear the Transfer case for AWD.

Based on the research from Tony@Motordyne, it seems that a y (2 to 1 merge collector) further back from the engine would provide better top-end torque. This support my initial speculation why the ypipe on the HR has a merge collector further back from the engine (much further back when compared to the "T-shaped" ypipe on the DE engine)

Just my 2cents