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I'm just wondering if exhaust manis of a 3400 will fit on a 3100, I imagine they would but I wanted to be sure. Do they flow better than the 3100 manifolds?
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Dual Outlet Exhaust with Resonator Delete, Front STB, Rear STB, GMPP Trailing Arms -
the manifolds are pretty much the same. The only different one is the rear one.
I used the newer one to make it easier to get the downpipe on and off. I used the 3400/1999+ 3100 rear manifold, and the 1999 Lumina downpipe.
Lots more room. I can now do the downpipe from the top of the car instead of getting under it.
The only thing I can think of is if you are thinking of the 3500 manifolds.Taylor
1988 Olds Cutlass Supreme 3100 MPFI
1990 Pontiac Grand Prix STE 3.1 MPFI
1994 Olds Cutlass Supreme convertible
1998 Lincoln Mark VIII
"find something simple and complicate it"
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No I mean the 3400 manifolds, I want to know if they will make a difference. I'm pretty sure the 3500 manis won't work, like every other 3500 part to a 3100.
Dual Outlet Exhaust with Resonator Delete, Front STB, Rear STB, GMPP Trailing ArmsComment
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With the exception of the rear manifold, there is no difference between the 3100 and 3400. Even still, the rear is only different in the outlet for the downpipe.
I had the 3100 rear manifold on my car at one time, and swapping to the other one did not really do anything that I could tell. It only made it easier to do the downpipe. A LOT easier.Taylor
1988 Olds Cutlass Supreme 3100 MPFI
1990 Pontiac Grand Prix STE 3.1 MPFI
1994 Olds Cutlass Supreme convertible
1998 Lincoln Mark VIII
"find something simple and complicate it"
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the 3400 rear flows better due to the "header" design..
i doubt you'll gain anything drastic from it being that they're still undersized.
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Like I said, "I had the 3100 rear manifold on my car at one time, and swapping to the other one did not really do anything that I could tell. It only made it easier to do the downpipe. A LOT easier."
Not sure what a REAL dyno would show, but as far as the ASS-DYNO goes, there was no noticeable difference. I just like that it is easier to get to the nuts.Taylor
1988 Olds Cutlass Supreme 3100 MPFI
1990 Pontiac Grand Prix STE 3.1 MPFI
1994 Olds Cutlass Supreme convertible
1998 Lincoln Mark VIII
"find something simple and complicate it"
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Well, I'm planning on getting the exhaust manifolds ported, and by the looks of it the 3400 style would probably be the better one to go with. I know headers are better, but in order for me to get some that fit my car will cost me close to a grand, and for that money I'd rather switch to a 3400.
Dual Outlet Exhaust with Resonator Delete, Front STB, Rear STB, GMPP Trailing ArmsComment
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I wouldn't mess with porting cast iron manifolds, it's alot of work for very little gain.Originally posted by Sidewinder View Post
If you look inside a 3400 rear manifold it's pretty obvious what the problem is and i don't think you could port enough to fix it...
Have you tried 3500 manifolds yet? they fit on a Jbody... lolComment
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Or those 2005 3400 manifolds (they have a cross over and are a LOT bigger than the older 3400 manifolds I hear).sigpic
New 2010 project (click image)
1994 3100 BERETTA. 200,000+ miles
16.0 1/4 mile when stock. Now ???
Original L82 Longblock with LA1, LX9, LX5 parts
Manifold-back 2.5" SS Mandrel Exhaust. Hardware is SS too.
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Well I'm not entirely sure if I can find either of those, my local junkyard doesn't have a lot of new cars. I'd rather not buy manifolds if I don't know if they will fit. I would buy headers but it would cost me somewhere around $850 which isn't entirely worth it when I can buy a 3400 for that.
Dual Outlet Exhaust with Resonator Delete, Front STB, Rear STB, GMPP Trailing ArmsComment
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The S&S headers are cheap. Have you looked at them?sigpic New 2010 project (click image)
1994 3100 BERETTA. 200,000+ miles
16.0 1/4 mile when stock. Now ???
Original L82 Longblock with LA1, LX9, LX5 parts
Manifold-back 2.5" SS Mandrel Exhaust. Hardware is SS too.
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If i remember right GM sells the front 3500 manifolds for $50 each.. not sure if they come with the downpipe flange or not though...Comment
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I have the header style 3500 manifold, front and rear I could send to ya. That is if you are interested in some custom exhaust work to connect the front manifold to the rear, but they are def. the best flowing manifolds you will find
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1996 3500GP Coupe, "Bright White".
3500 swap, 60degreeV6 1393 Cam, Ported Intakes, Comp Cams Valve Springs, 65mm TB, Custom Pushrods, S&S Headers, 97 PCM with DHP Powrtuner, 2.5" back to dual Hooker Aerochambers, SS Brake Lines, Addco swaybar, KYB's, Intrax Springs, STB's, etc!Comment
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Headers are worth it... they dropped at least 3 tenths off of my 1/4 time And I only paid 525 for mine... SS uncoated.
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3500 Build, Comp XFI Cam 218/230 .050 dur .570/.568 lift 113LSA
Fully Balanced, Ported, 3 Angle Valve Job, 65mm TCE TB, S&S Headers.
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12.61@105 Epping NH Oct 2015 Nitrous 100shot (melted plugs) 13.58@98.8 N/A 3200LBSComment
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Are there any differences between the exhaust manifolds and how they connect to the downpipe? I'm looking to get the downpipe back to the cat redone to remove the restrictions and need to know (from the pictures the 3100/3400 look different). If there is differences I'll get the new manifolds and put them on my car, if not I'm going to get the downpipe done.
Will the 3500 manifolds bolt onto a 3100?
As for headers, there are none made that will fit into the Lumina/Monte engine bay without modification of the firewall or of the actual headers.Last edited by Sidewinder; 06-25-2007, 11:55 PM.
Dual Outlet Exhaust with Resonator Delete, Front STB, Rear STB, GMPP Trailing ArmsComment
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