Okay, I've read many threads on this forum about the Y-Pipe. At one time I thought about getting one and then felt it was a hassle to find a good place to weld it to my exhaust. Now recently a member of the g community in my area said that he has the Y-Pipe connected to his exhaust without any welding being performed. Does this actually work? Is there any leaks? Also he said he was able to do so because he left off the resonator. What is the resonator for? And does it effects emissions? Please HELP!!!

 

I am interested in replacing my Y-pipe as well. Several threads in here have mentioned that removing the resonator makes the car loud and gives it the annoying "ricer" sound. Any comments?

 

c'mon anyone? I'm about to post a link to this thread in the Coupe forums if someone doesn't reply.

 

ok... you haven't mentioned if you have a coupe or sedan, but since you said you were gonna post in the coupe forum, i'm gonna assume you have one...

on the coupe exhaust, nothing is welded, everything is connected with bolts and gaskets (see Fig.1 below)... there are 4 major parts to the stock exhaust:

headers (merge each bank of 3 outputs from the cylinders into 1) - there are 2 of them that then connect to the....
cats - 2 of them also, clean your smog output and then send it to the....
y-pipe (see Fig.2) - merges the output of the 2 cats (left and right) into one center pipe which then goes to the....
midpipe & muffler - midpipe (see Fig.3) is just a single connecting pipe from the y-pipe to the muffler (aka rear section) which then quiets things down and sends it out to the exhaust tips

on my car, the only thing still stock is the midpipe and muffler... i have changed out the headers, cats, and y-pipe. adding an aftermarket y-pipe is actually very simple and you could probably do it yourself. at an exhaust shop, it should take less than 30 minutes and require zero welding.

i may actually remove the y-pipe in the very near future because i may be going with a true dual exhaust (which keeps the exhaust as 2 separate pipes from the cats all the way to the exhaust tips). if either of you are interested, i may be selling it. (it's a Fujitsubo, one of the most well designed y-pipes i've seen for the G35, and it will fit coupe or sedan) shoot me a PM if interested.

also, i don't think the stock y-pipe has any kind of resonator on it... there is one in the midpipe, but on coupes it's very small (on the sedan there is a HUGE resonator, which many sedan owners have fixed by installing a coupe midpipe instead)

FIG.1 EXHAUST CONNECTIONS


FIG.2 STOCK Y-PIPE


FIG.3 STOCK MIDPIPE

 

So that means I dont have to weld anything and it should bolt on with no problems? How much are you selling the Y-Pipe for? PM me. Thanks.

 

correct... just unbolt the stock Y-pipe and bolt on the aftermarket one... shouldn't take an exhaust shop more than 15 minutes MAX

PM SENT

 

whew!

 

I know the Fujitsubo is 3" Y-pipe. What's the diameter of the stock mid-pipe? I am guessing its smaller than 3", so I was wondering how well the y-pipe will fit without any leaks, since you are connecting a smaller midpipe opening to a bigger y-pipe opening.

Wouldn't there be a lot of pressure on the gasket?

 

2.5" That's why the Y I'm having made will be the same. I believe that's too much flow and, besides, going to a reducer in the Y to middy transition only re-creates the back-preesure. We'll see..........

 

I heard that Tanabe is releasing a new Y-Pipe that will increase airflow and work with our 2.5" midpipe.

 

Alright, let me try to decipher everything in this thread here.

Mbq no it isn't necessary to have the Y-pipe welded however you could have a Dr. Gas Reducer cone installed. Essentially this is a piece that some of us have chosen to add to our stock mid pipes in order to make it fit more seamlessly with the aftermarket y-pipe. As mentioned, the majority of the aftermarket Y's have a 3in diameter where as the stock coupe midpipe is 2.5. As the name states, its basically a gradually slopping cone that transitions between the two diameters. I've got it with my setup and I like how it turned out. Instal was a breeze, I took my G to a garage and they had the entire thing installed (cone welded and Y pipe bolted in) in 20 minutes, cost me about $30-40.

As far as the situation with the resonator goes, its not necessary to cut if off but your friend probably did it anyway so he'd could get a little more sound out of the stock system. Some people have done this but claim the exhaust tone gets raspy and doesn't sound good at all.

 

BirdMan - Thanks for mentioning the Dr. Gas Reducer Cone. I was just getting ready to start looking for one.

SI_G35Coupe - How did you like the sound (quality as well as volume) with the headers/cats/Y-pipe upgrades while still running the rear section. I'm pretty set on this for now, but I'd still like to know what to expect.

 

this answered alot of my questions haha. nice!

 

how well does an aftermarket exhaust (namly fujitsubo) fit on an oem y-pipe...the reason im asking is I was gonna get the midpipe and muffler and then in like 2 months get the y-pipe...

 

It should bolt up just fine but the pipe sizes will be mismatched. The usual pipe diameter of a aftermarket exhaust is 3" and the factory y-pipe is 2.5"

I know my aftermarket y-pipe and my stock exhaust flanges lined up and I was able to connect and tighten them but the sizes were mismatched. It sounds horrible btw. It sounds a bit raspy and likes to buzz when first warming up. I'm trying to teach it a tune but it's not cooperating.

I just may live with it this year and either order a dual or a fuji to match the y-pipe for next year. Besides I have other things to worry about.