Another Exhaust Thread - FE 390
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Another Exhaust Thread - FE 390
Yes, another exhaust thread. I thought I'd post this here rather than the Exhaust section to here from some guys with similar/same motors.
I've got a 390 with an RV cam (I presume). It currently has dual exhaust. Not sure of the brand but it's a little mild. I'm in rural TX and don't have emission or noise regulations.
I'm looking for loud, poppin, throaty, floor n' roar, slap yo momma sound. I'm considering Headman short tube headers but I'm completely undecided on the brand and style of exhaust.
The truck is 75' Highboy.
Your thoughts?
I've got a 390 with an RV cam (I presume). It currently has dual exhaust. Not sure of the brand but it's a little mild. I'm in rural TX and don't have emission or noise regulations.
I'm looking for loud, poppin, throaty, floor n' roar, slap yo momma sound. I'm considering Headman short tube headers but I'm completely undecided on the brand and style of exhaust.
The truck is 75' Highboy.
Your thoughts?
Fleet Owner
Joined: Dec 2009
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From: NorCal
Hedman long tubes. 2.5-inch mandrel bent tubing, and Dynomax race bullets or any other "glasspack". The shorter, the louder.
Also consider Moroso Spiral Flows... it's an auger-style muffler with no 'glass to crumble and blow out.
Also consider Moroso Spiral Flows... it's an auger-style muffler with no 'glass to crumble and blow out.
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What's the benefit of the long over the short tube?
How would you compare the sound between the Dynomax Race Bullets and the Moroso Spiral?
Fleet Owner
Joined: Dec 2009
Posts: 20,678
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From: NorCal
Exhaust sound is highly subjective so it's up to you to decide what is "best" to you. I went with Morosos cuz glasspacks eventually blow out and I didn't want Flowmasters... plus the Spiral Flows are really compact.
My longtubes feed a cross-over tube so both tubes go down the right frame rail. Sound clip at the bottom at idle and high RPM.:
<embed width="440" height="420" type="application/x-shockwave-flash" src="http://v5.tinypic.com/player.swf?file=34gpukh&s=5">
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Long tube headers all the way!
You could do headers and a pipe dumped at your pleasing I suppose. I would imagine it would make your ears bleed though.
Straight through designs-glass packs- all give pretty much the same sound regardless of brand. There are no chambers to change, only perforation and length. The shorter the louder.
I would opt for Summit Racings Street&Strip mufflers. They are about $30 each so running duals is easy on the wallet. You can search sound clips on YouTube.
Anyway you go, it is smart to have an X pipe or H pipe welded in for engine scavenging. An X pipe will be better for performance but it can be hard to fit one under our trucks, especially with outside of the frame headers.
You could do headers and a pipe dumped at your pleasing I suppose. I would imagine it would make your ears bleed though.
Straight through designs-glass packs- all give pretty much the same sound regardless of brand. There are no chambers to change, only perforation and length. The shorter the louder.
I would opt for Summit Racings Street&Strip mufflers. They are about $30 each so running duals is easy on the wallet. You can search sound clips on YouTube.
Anyway you go, it is smart to have an X pipe or H pipe welded in for engine scavenging. An X pipe will be better for performance but it can be hard to fit one under our trucks, especially with outside of the frame headers.
Fleet Owner
Joined: Dec 2009
Posts: 20,678
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From: NorCal
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My pickup has a 460, but I went with Hooker Super Competition headers, 40 series Flowmasters, and 3" pipe all the way to the back bumper. I really like the way it sounds from outside, and it is really quiet in the cab.
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My understanding is that scavenging refers to the draft or pull behind each pulse of exhaust. I'm not sure how the H or X helps with this although I've seen it mentioned before.
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For some reason, it's not visible on my end. I see 2 pics, but that's it. I've clicked on them to verify they're not in fact videos. I've also clicked all the visible links above and still no video.
I'm viewing on a iPhone and iPad. I've also clicked out of mobile mode to desktop/full site mode to see if it was a mobile glitch.
I trust it's there, but for some reason not visible on my end. Or at least not thru my beer goggles.
I'm viewing on a iPhone and iPad. I've also clicked out of mobile mode to desktop/full site mode to see if it was a mobile glitch.
I trust it's there, but for some reason not visible on my end. Or at least not thru my beer goggles.
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
For some reason, it's not visible on my end. I see 2 pics, but that's it. I've clicked on them to verify they're not in fact videos. I've also clicked all the visible links above and still no video.
I'm viewing on a iPhone and iPad. I've also clicked out of mobile mode to desktop/full site mode to see if it was a mobile glitch.
I trust it's there, but for some reason not visible on my end. Or at least not thru my beer goggles.
I'm viewing on a iPhone and iPad. I've also clicked out of mobile mode to desktop/full site mode to see if it was a mobile glitch.
I trust it's there, but for some reason not visible on my end. Or at least not thru my beer goggles.
Elder User
Joined: Jun 2013
Posts: 685
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Perhaps you could help me better understand this. I'm new to this forum. I've seen the term 'scavenging' used in a few threads but I'm not sure I fully understand.
My understanding is that scavenging refers to the draft or pull behind each pulse of exhaust. I'm not sure how the H or X helps with this although I've seen it mentioned before.
My understanding is that scavenging refers to the draft or pull behind each pulse of exhaust. I'm not sure how the H or X helps with this although I've seen it mentioned before.
In theory all cylinders should preform exactly the same. In reality some preform better than others. The cross flow evens out the preformance on the exhaust side and aids a more complete combustion.
X pipes will show significant gains on the dyno and an H pipe will provide some improvement to the bottom end torque.