Exhaust recommendations
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Senior User
Joined: May 2013
Posts: 139
Likes: 0
From: Hampton Roads VA
Exhaust recommendations
I would like some advice on how to do my exhaust. I'm getting close on my 73 SCS and want some opinions on what to put in the pipes. I am going to dump the exhaust out from right in front of the rear tires. I have a 390 Fe that I bore forty over. I am running a moderate pro Comp cam. The pipes I took off are just straight pipes with 24 inch glass packs. It sounded really good to me when I took it off with a worn out motor and leaking *** headers. I am just wondering if I should stick with the glass packs or maybe putting on some forty series flow Masters. Let me know what you guys think. I am about to put the bed on my truck and wanted get the pipes in first.
Laughing Gas
Joined: Aug 2012
Posts: 920
Likes: 20
From: Malheur Co. OR
Not a fan, personally, of Flowmasters. FE engines with dual glasspacks have a nice hotrod sound. If you liked that sound stick with it. You can get a new set the same length rather than reuse the old stuff if you like.
Cargo Master
Joined: Nov 2011
Posts: 3,354
Likes: 49
From: Great American SouthWest
I've got glass packs on the copper truck and love them. Got flowMasters on the brown truck and they're fine, I prefer the sound off the glass packs-especially when it's echoing off other cars when driving in traffic...
Laughing Gas
Joined: Aug 2010
Posts: 896
Likes: 55
From: Bothell
With your rebuild did you up the compression? I had glasspacks on a low compression motor and after rebuilding it to a 10:1 motor it was crazy loud with the same glasspacks. Just something to consider.
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Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
2.5-inch mandrel bent tubing and round case Magnaflow mufflers..... makes it sound like NASCAR racecar.
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Fleet Mechanic
Joined: Feb 2004
Posts: 1,509
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From: Arlington,Wa
A few years ago, I ran 31" glasspacks on my 351M. A little back story on it. I was running headers and dual exhaust, Eddy intake, Carter 625 and a Comp Cam 268 camshaft...always had dudes asking me if it was a 390. 
Go with the glasspacks!! After they rotted out, I had them replaced with 41" glasspacks....didn't sound the same.
Go with the glasspacks!! After they rotted out, I had them replaced with 41" glasspacks....didn't sound the same.
Thread Starter
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Senior User
Joined: May 2013
Posts: 139
Likes: 0
From: Hampton Roads VA
Nice trucks guys! Steven that is just like what mine sounded like when I drive it home. I like it. I am only a couple months out from starting mine. I will make sure to post a video on this thread.