Does this look like a good 3" to 4" Y pipe?

Intercooler2 · 2008-07-20 21:24:01

http://www.mandrelbendingsolutions.com/servlet/Detail?no=447 Anyone see a better design?

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Jul 20, 2008 | 04:24 PM

Intercooler2

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From: North East, MD

Does this look like a good 3" to 4" Y pipe?

http://www.mandrelbendingsolutions.c.../Detail?no=447

Anyone see a better design?

Jul 20, 2008 | 04:35 PM

BenLaz

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look for the flowmaster dual 3" to single 4" outlet merge... a much better design then that one!

Jul 20, 2008 | 04:36 PM

TheSilverOne

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yeah that one =

Jul 20, 2008 | 04:37 PM

HavATampa

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Doesn't seem very smooth to me. Looks as though the exhaust gases will collide with each other as they enter the single pipe. They say it's a 4" In/3" Out. I think they are saying two 2" pipes in equals 4" and the exit is 3". Are you looking for a 4" exit merge? A better 3" to 4" merge would be the Flowmaster. Thunder Racing p/n 30-Y300400

Jul 20, 2008 | 04:50 PM

Intercooler2

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Yea! I am going to do 3" pipe off my headers to a Y then go from that to 4" back to my muffler. So 3 to 4.

Jul 20, 2008 | 04:53 PM

HavATampa

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From: Louisiana

It's going to be hard to find anything better than the Flowmaster merge then.

Quote:

Originally Posted by Intercooler2

Yea! I am going to do 3" pipe off my headers to a Y then go from that to 4" back to my muffler. So 3 to 4.

Jul 20, 2008 | 08:31 PM

Marc 85Z28

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From: MD

Contact Tyson at PAF (or PM Indukted1)

He is in Westminster, and can do literally anything you want exhaust-wise. Very talented fabricator

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Aug 4, 2008 | 08:33 PM

TheSilverOne

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From: Taxachusetts

you'd have to use a 4 inch to 3 inch reducer, then a 3 inch reducer to a 2.75 inch reducer.

Aug 4, 2008 | 08:37 PM

#10

99345hp

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why bother with the 4" if you are going to just neck it all down to 2.75"?

Aug 4, 2008 | 09:01 PM

#11

Full-Force

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Because most people put a cutout on it before they neck it down.

Aug 4, 2008 | 09:12 PM

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94'BLKBRD

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Quote:

Originally Posted by 99345hp

why bother with the 4" if you are going to just neck it all down to 2.75"?

I agree.

Aug 4, 2008 | 09:21 PM

#13

HavATampa

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From: Louisiana

Don't bother necking it down. Just keep going 4" all the way to the back.
https://ls1tech.com/forums/showthrea...ferrerid=13535

Aug 4, 2008 | 09:24 PM

#14

sixvi6-camaro

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Quote:

Originally Posted by Intercooler2

sure.. make it yourself other than that there is no good way to reduce the exhaust to that extreme without doing it using a off the shelf reducers.

Just to give you an idea.. I make my own Offset reducers from 3" to 2.5" to clear the underbody brace piece easier in our F-cars. 4" to 2.75 is a bit crazy but it can be done and is a bit silly to cause such a serious restriction but to each his own.. Here are some pics of the last 3" id - 2.5" od one I made..

http://home.comcast.net/~pewter_camaro/welding_17.jpg
http://home.comcast.net/~pewter_camaro/welding_18.jpg
http://home.comcast.net/~pewter_camaro/welding_19.jpg
and some pics of an older one showing it completed..
http://home.comcast.net/~pewter_camaro/welding_02.jpg
http://home.comcast.net/~pewter_camaro/welding_03.jpg

Last edited by sixvi6-camaro; Aug 4, 2008 at 09:34 PM.

Aug 4, 2008 | 09:37 PM

#15

Intercooler2

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Yea a 4" cutout before. Why? Because with the stock muffler setup I know it won't be crazy loud or drone. It's still my cruiser! But I can open up the 4" and get great flow at the track. Also if you come of the headers with 3" you have to use the 4" Y or go to a 2.5" size to 3" off the Y. I prefer 4"