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Exhaust size for 5.7
#2427941
01/02/18 08:15 PM
01/02/18 08:15 PM
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Joined: Jan 2003
Posts: 888 Wooster, Ohio
kpzbee
OP
super stock
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OP
super stock
Joined: Jan 2003
Posts: 888
Wooster, Ohio
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I'm doing a Eagle swap into mt '73 AMC Javelin and am currently looking at how to route exhaust under it before I finish up my trans tunnel. I'm using OE SRT shorties and they measure 2.75" ID. Would 2.5" be adequate or should I go 3" back to the mufflers and 2.5 tailpipes? I'm going to have to use oval pipe since clearance is an issue. This is a street driver used for long hauls so wringing every bit of hp is not my main concern. Thoughts? Suggestions? Thanks.
"It's funny how one project eventually leads (or forces) you into another one. It's really just one endless project designed to induce insanity and bankruptcy."
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Re: Exhaust size for 5.7
[Re: kpzbee]
#2427960
01/02/18 09:00 PM
01/02/18 09:00 PM
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Joined: Jun 2003
Posts: 9,225 Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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Im a min 3" guy. I would put 3" on a lawnmower
Gen 3 power 6.22@110, 9.85@135 Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Exhaust size for 5.7
[Re: kpzbee]
#2428024
01/02/18 10:48 PM
01/02/18 10:48 PM
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Joined: Oct 2017
Posts: 80 Australia
aus370
member
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member
Joined: Oct 2017
Posts: 80
Australia
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I'd do the 3.0 to the muffs , then 2.5 after that , and put some straight through offset muffs in the tail pipes if you want it a little quieter . And some sort of balance pipe is a must , but that's just my opinion .
Last edited by aus370; 01/02/18 10:54 PM.
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Re: Exhaust size for 5.7
[Re: kpzbee]
#2428762
01/04/18 09:58 AM
01/04/18 09:58 AM
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Joined: Jan 2003
Posts: 888 Wooster, Ohio
kpzbee
OP
super stock
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OP
super stock
Joined: Jan 2003
Posts: 888
Wooster, Ohio
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Thanks for the opinions. I'm going to go with 2.5" X pipe system. Getting 2.5" tailpipes in there is going to be tuff but it will happen somehow.
"It's funny how one project eventually leads (or forces) you into another one. It's really just one endless project designed to induce insanity and bankruptcy."
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Re: Exhaust size for 5.7
[Re: WO23Coronet]
#2429368
01/05/18 10:06 AM
01/05/18 10:06 AM
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Joined: Jan 2003
Posts: 888 Wooster, Ohio
kpzbee
OP
super stock
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OP
super stock
Joined: Jan 2003
Posts: 888
Wooster, Ohio
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The right side fits perfect but the left is hitting the starter. The car version swings away from the block further so I have a pair of those on the way to see if that will work. I'm trying to avoid the cost of special headers. I'm having to use a 4L60E trans so there's an adapter in it and it makes the starter stick out slightly further than it did on the 518. I couldn't get the 518 to fit in the tunnel with the Hemi like it did with the Magnum I had in it. I picked up a 3' length of 2.5" pipe yesterday and with some drive shaft tunnel "massaging" it will fit, abet very tight. A tight X pipe should fit right behind the X member.
"It's funny how one project eventually leads (or forces) you into another one. It's really just one endless project designed to induce insanity and bankruptcy."
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