exhaust woes...
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Postmaster
Joined: Mar 2002
Posts: 3,545
Likes: 4
From: Coal Region
exhaust woes...
well i decided to make my truck have duals. i have 2.5" pipe running into a flow delta flow 40 series now.
my question is if i use a 2.5 y-pipe or should i use 3" (3" comes off the 1st cat from factory) and use 2.5" pipe to go into another flow delta flow 40 series.
or could i run duals from the manifolds with 2.5" pipe...
questions are:will i loose any low end with either choice? and will it actually make me loose power?
i dont really wanna go out and buy 2 new flows instead of one...
my question is if i use a 2.5 y-pipe or should i use 3" (3" comes off the 1st cat from factory) and use 2.5" pipe to go into another flow delta flow 40 series.
or could i run duals from the manifolds with 2.5" pipe...
questions are:will i loose any low end with either choice? and will it actually make me loose power?
i dont really wanna go out and buy 2 new flows instead of one...
Hotshot
Joined: Oct 2002
Posts: 18,488
Likes: 22
From: The Big, Oregon
exhaust woes...
If you use dual 2" pipes, you won't loose power. Duals on these engines walk a real fine line, I have the 2" pipes, this thing used to have dual 2 1/2", and it had no low end. A single 3" from the first cat back works well, this is what I am doing with the v-8. I am using the 300-6EFI front cat that came with my downpipes, hollowing it out, running the pipes from the manifolds into it, and 3" out. Looks legal. I would keep the stock cat in place, and intact, though. The engine needs some back pressure to run right.
Jared
Jared
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Postmaster
Joined: Mar 2002
Posts: 3,545
Likes: 4
From: Coal Region
exhaust woes...
hmm...so could i use the 3" from the 1st cat into a y-pipe and run 2.5" duals from that? i dont have the $$ to go out and buy 2 new flowmasters or a whole new exhaust job...i was gunna do this myself...
Postmaster
Joined: May 2002
Posts: 3,241
Likes: 3
From: Broken Arrow, OK
exhaust woes...
Ordinarily I would say that dual 2.5" pipes is too much, but the further away from the exhaust valve you get the less important pipe size becomes. By the time you get all the way back past the second cat you could probably run 2.5" duals and be OK. If you run duals from the manifolds with 2.5" pipe you are going to have problems. First of all, you will lose a very noticable amount of low end torque. Secondly, you aren't going to gain anything on the top end because the manifolds will still be the bigger restriction of the two. I wouldn't go bigger than 2.25 on duals from the manifolds back, and 2.0 would probably be better. I have 2.25 on mine because that's what size the header collectors were and I had 2.25 pipe laying around. If I could have picked any size it would have been 2.125, but that isn't very practical. If you already have a muffler you can run the smaller pipe up to the muffler, then flare it out to the larger size at the muffler inlet. This used to be a common setup back when mufflers were a large restriction.
Thread Starter
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Postmaster
Joined: Mar 2002
Posts: 3,545
Likes: 4
From: Coal Region
exhaust woes...
so ill use 2.25" pipe from the 1st cat to the y pipe and 2.5" after?? i plan on adding a cam and maybe p&p'd head in the future so i dont wanna have to worry about my ehaust.
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Postmaster
Joined: Mar 2002
Posts: 3,545
Likes: 4
From: Coal Region
exhaust woes...
what about using a 2.5" in dual 2.5" out muffler?? cuz then all i would have to do it take my old one out, put the new one in and run the exhaust on the other side...
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Postmaster
Joined: May 2002
Posts: 3,241
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From: Broken Arrow, OK
exhaust woes...
A single 2.5" inlet with dual 2.5" outlets would be fine. A single 2.5" pipe is good up to about 230-240 hp.
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Joined: Nov 2002
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From: Kentucky
exhaust woes...
Originally posted by Optikal Illushun::
thanx
thanx guys, i guess ill go with the y-pipe after the muffler for now
Fake Duals are better than no Duals...If you gotta have them.....
You are probably better off with your existing system
Putting money into duals on these 300's is not very beneficial...The money can buy you better improvements....
The 2.5 inch system will MORE than do (Much more) a 300 with a CAM and ported and polished head.....
but if you gotta have them DUAL EXHAUST...The "Y" pipe is the most practical
ftwfred
thanx
thanx guys, i guess ill go with the y-pipe after the muffler for now
Fake Duals are better than no Duals...If you gotta have them.....
You are probably better off with your existing system
Putting money into duals on these 300's is not very beneficial...The money can buy you better improvements....
The 2.5 inch system will MORE than do (Much more) a 300 with a CAM and ported and polished head.....
but if you gotta have them DUAL EXHAUST...The "Y" pipe is the most practical
ftwfred
Last edited by ftwfred; Jan 30, 2003 at 08:29 PM.