Does this look like a good 3" to 4" Y pipe?
#4
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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
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#8
Well running into some issues here. We had my car up on the lift figuring out what to do and the 3" off the collectors to the Y is no problem. The problem is going from the Y back 4" mating to the 2.75" stock piece. Nobody makes a 4" to 2.75" transition. Anyone know how to accomplish this or someone who can make such a piece? I looked on-line and found nothing.
#14
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Well running into some issues here. We had my car up on the lift figuring out what to do and the 3" off the collectors to the Y is no problem. The problem is going from the Y back 4" mating to the 2.75" stock piece. Nobody makes a 4" to 2.75" transition. Anyone know how to accomplish this or someone who can make such a piece? I looked on-line and found nothing.
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; 08-04-2008 at 09:34 PM.
#15
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"