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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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Posts: 888
Wooster, Ohio
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kpzbee Offline OP
super stock
kpzbee  Offline OP
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Wooster, Ohio
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."
Re: Exhaust size for 5.7 [Re: kpzbee] #2427960
01/02/18 09:00 PM
01/02/18 09:00 PM
Joined: Jun 2003
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Charleston
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sixpackgut Offline
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Charleston
Im a min 3" guy. I would put 3" on a lawnmower


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Re: Exhaust size for 5.7 [Re: kpzbee] #2428010
01/02/18 10:21 PM
01/02/18 10:21 PM
Joined: Nov 2004
Posts: 25,050
Texas
GoodysGotaCuda Offline
5.7L Hemi, 6spd
GoodysGotaCuda  Offline
5.7L Hemi, 6spd

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Posts: 25,050
Texas
If you're staying with stock manifolds, I would leave it as 2.5".


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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
Joined: Oct 2017
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Australia
aus370 Offline
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Australia
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.


Re: Exhaust size for 5.7 [Re: kpzbee] #2428198
01/03/18 10:34 AM
01/03/18 10:34 AM
Joined: Jan 2006
Posts: 1,400
Trumbauersville PA
ric3xrt Offline
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Trumbauersville PA
My .02 is 2.5in with an X-pipe 2.5in tail pipe,
3in no X-pipe, 2.5 tail pipe

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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Posts: 888
Wooster, Ohio
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kpzbee Offline OP
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kpzbee  Offline OP
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Wooster, Ohio
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."
Re: Exhaust size for 5.7 [Re: kpzbee] #2428994
01/04/18 05:46 PM
01/04/18 05:46 PM
Joined: Jan 2008
Posts: 4,254
Canada
WO23Coronet Offline
master
WO23Coronet  Offline
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Posts: 4,254
Canada
How well do the SRT shorties fit?

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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Posts: 888
Wooster, Ohio
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kpzbee Offline OP
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kpzbee  Offline OP
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Wooster, Ohio
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. frown 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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