Looking for 3" exhaust kit

[pontiacgp]

Also, I think the bit about losing velocity is hooey by the way. They proved it on Engine Masters.

Hot gases flow faster than cool gases. The larger the tube the slower the gases travel which allows the gases to cool down. You should do some research on exhaust systems instead of watching a video.
http://www.exhaustvideos.com/faq/how-to-calculate-muffler-size-pipe-diameter/

565BBChevy doesn't have his headers wrapped just to look good, they are wrapped to keep the exhaust gasses hot so they keep flowing fast.

 

[Turbolq4]

2" pre turbo keeps velocity high which helps spool the turbo. 4" turbo back keeps back pressure low and flows huge amounts of air, it still costs power even though it's huge.

 

[Michael Bennett]

Sure, it helps in those applications, but for what I'm doing I will lose nothing by using 3" vs 2 1/2" due to velocity. This post has gotten off track. I still want to know if anyone has used A body exhaust on a G body and how it fit.

 

[81cutlass]

I bought the pypes 3" rear exit and cut right before the 45 degree bend going back and clocked it 180 degrees and rewelded, and then moved the former bracket to mount on the frame like the normal rear exit does.

 

[565bbchevy]

I still want to know if anyone has used A body exhaust on a G body and how it fit.

If you have the skills the best way to get an exhaust to fit the way you want is to make your own and you could use a kit something like this to do it. https://www.summitracing.com/parts/sum-670147/overview/
Once you get to 3" and above you become really limited on car specific exhaust systems and even ones designed for a Gbody don't always fit well, after I made the h-pipe for my car I did mockups first for the tailpipes and then ordered mandrel bends to get the angles I needed.

 

[Michael Bennett]

I bought the pypes 3" rear exit and cut right before the 45 degree bend going back and clocked it 180 degrees and rewelded, and then moved the former bracket to mount on the frame like the normal rear exit does.

Pypes is frustrating because they sell a side exit 3" kit that is cat back with a y pipe but only offer full duals in Monte SS style. You'd think the tail pipes would be the same but I called and they wouldn't sell it that way.

 

[Michael Bennett]

If you have the skills the best way to get an exhaust to fit the way you want is to make your own and you could use a kit something like this to do it. https://www.summitracing.com/parts/sum-670147/overview/
Once you get to 3" and above you become really limited on car specific exhaust systems and even ones designed for a Gbody don't always fit well, after I made the h-pipe for my car I did mockups first for the tailpipes and then ordered mandrel bends to get the angles I needed.
View attachment 91182 View attachment 91183

If I don't find anything else I might just use the flowmaster 3" universal kit.

 

[lilbowtie]

With your engine size I can under stand you wanting a 3 inch system although 2.5 is sufficient. No - a body won't work w/o mod. You can always get the pypes 3 inch universal XVA14 which I used. Still think it's a waste of money.

 

[lilbowtie]

Also, I think the bit about losing velocity is hooey by the way. They proved it on Engine Masters.

If that's what you believe that's fine - I changed from Shoenfeld 1.75 TO Shoenfeld 1.75 stepped to 1.875 headers and lost .05 ET. That's computer corrected to the weather and stepped headers were coated. Now that's nothing to feel but never the less a loss.

 

[Michael Bennett]

You are totally right about the velocity, I should have stated that I was talking about my particular application it wouldn't make a difference.