I<3 A32's

iTrader: (1)

Should. I up grade my y pipe. Its. Only 2 1/4

NmexMAX

iTrader: (22)

Sparks did so on his 3.5L with headers and saw no difference, so no, you shouldn't. What headers do you have now?

The Wizard

iTrader: (43)

4" or go home

and are you talking about the ypipe or catback?

gatsugansu

iTrader: (3)

Better go 5" just in case, if you add more horsepower in the future. You know, with Nismo stickers and stuff....

I<3 A32's

iTrader: (1)

The y pipe. I'm 3in cat back

I have the MeganRace headers

NmexMAX

iTrader: (22)

So you really don't have decent headers, you have essentially glorified OEM manifolds.

aackshun

iTrader: (3)

Nmexmaxmanmannymod, you're drunk sir.

You need to get back to dem fif gen maximars.

Fauken

iTrader: (6)

He has the vq35 long tube ones.

schmellyfart

iTrader: (46)

He has altima headers.
Didn't Darren say there were gains with sparks old y pipe?

I<3 A32's

iTrader: (1)

What. Gen you got

NmexMAX

iTrader: (22)

I just googled meagen headers 4th gen and saw cheap ass Custom Maxima type headers. Didn't see anywhere that it was clarified.

In any case, Sparks never saw any gains with his custom 3" y, and it sounded awful. I'm positive that's why he went back to the Cattman Y that comes with the headers, bad sound and no gain.

http://forums.maxima.org/7864834-post1.html

And that's on an NA VQ35. Pretty sure it would be the same for an NA VQ30.


Gen I Cattman's for 95-99 Maximas with the EGR modded for my 03.

Fauken

iTrader: (6)

I understand your confusion as he never stated exactly what he had. We just know because it's our bud. Maybe some benefit would occur with it opening to 3" if they gradually get to 3 from union piece to end of flange, connect that to remaining exhaust system going 3". I prefer equal length just so the exhaust sounds better. I thought nothing negative comes from going 3" cat back on NA.

EDIT: never mind, read through the link and noticed he did that. Wish he would have tried equal length though, bet it would have sounded better. Also, did he have a resonator on the cat back? That could have helped with sound if e didn't.

I<3 A32's

iTrader: (1)

Well i got the. Altima. Ser. Headers. With a. Wich are. Long tube. A. Equal length. Y pipe. With a. Cheap ***. Muffler. Un till i can. Save. Up. For a. 3In. Skunk2. Oh and. A nice. Big. Resonater

aackshun

iTrader: (3)

I feel like that's where the failure occurred, is not having equal length piping before the merge.

I may not have actual headers, but I am going to put a better Y-pipe on the dirty one day (BETTER THAN STILLEN?! NANI?!), does anyone know the piping diameter of cattman's? I have planned on doing 2.5" for each bank to a 3" going out to the catback (also deleting the cat w/ this y-pipe).

The only reason why I'm not doing 3" on each bank is because there is not enough room underneath the motor to do it equal length, the only way to have 3" collectors is to do it spark's style. This is what I was told from a fabber, I haven't tried mocking it up, but after seeing how tight 2.5" is on a 6th gen I'll take his word for it.

By the By.... I'm talking outside piping diameter throughout this whole post. Not the ID.

And the fabber, was the guy that made these headers....

http://forums.maxima.org/6th-generat...ic-inside.html

Fauken

iTrader: (6)

Aackshin, you asking about after the union piece or the headers

Zigg

iTrader: (1)

I'm building a 3" aluminum exhaust and I'm only going to step up the diameter right before my stainless resonated test-pipe on my y-pipe. You really want the exhaust to be scavenged from the primaries. Once the exhaust starts to cool and slow down, you should step it up in size. 2.25" secondaries with a 2.5" merge, then flare it to 3" just before or just after the end of the y-pipe should be best, unless you're running a roots blower or something... which you're not.

aackshun

iTrader: (3)

I'm not sure which technical jargon you're familiar with but the "Y-Pipe" or "Collector pipe" for the cattman headers would be the diameter I'm interested in.

Aluminum..... catback right?

Also what's that term for amount of flow area or something, because IIRC 2x 2.25's = 3.1" of flow so having a 2.5 is a bottleneck in terms of flow..... Someone correct me on this...

If so, join le club of awesome

Fauken

iTrader: (6)

Not too familiar with the jargon, but I think you wanted the headers to open up to 3" in at the flange where they join to the y pipe correct? I should have measured my cattman yesterday, I had it off the car to do some WB bung inspections.

aackshun

iTrader: (3)

I want the 3" to occur after both banks merge into one pipe, on the "y-pipe" for the cattman headers, that was my general idea.

Bank 1: Primary Header Piping 1 7/8ths? -> Primary Collector 2.25" -> 2.25" Secondary Tubing -> Secondary Collector 3" -> 3" Catback

The red bold portion is what I'm interested in having measured.

95naSTA

iTrader: (10)

Here's what I did with my cattman Y. Let it merge for a couple inches then reducer up to 3".