Exhaust question
Thread Starter
8th Gear
Joined: Jun 2014
Posts: 8
Likes: 0
From: Staten Island NY
Exhaust question
Just recently purchased a 78 L48, totally stock. The Stock exhaust just doesn't have that deep sound that I like. Would it be better to change the whole stock exhaust system or can I just change the mufflers to magnaflows or some other brand to get the desired sound?
Total novice here but learning
Thanks for the help
Total novice here but learning
Thanks for the help
Burning Brakes
Joined: May 2014
Posts: 884
Likes: 128
From: Rhine Georgia
When I got my 79 L48 it had factory exhaust with cat removed and some Magnaflow copies. It sounded really nice and strong (lots better than it really was). If all your after is sound and local laws allow I would copy this setup.
Racer
Joined: Jul 2013
Posts: 257
Likes: 36
Would it be better to change the whole stock exhaust system or can I just change the mufflers to magnaflows or some other brand to get the desired sound?
Total novice here but learning
Thanks for the help
Total novice here but learning
Thanks for the help
Racer
Joined: Apr 2014
Posts: 406
Likes: 22
From: Lyons Colorado
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Heel & Toe
Joined: Aug 2014
Posts: 15
Likes: 0
From: Hampton VA
ajmiceli,
I'm right there with you. I have a 78 L48 as well. Just got it as well. Its got a Dynomax system on it with a cat. I've been looking at doing a chambered exhaust set up. They are pretty loud. I haven't done much research on how they perform though. Not trying to hijack your thread, but does anyone have any thoughts on chambered exhausts?
I'm right there with you. I have a 78 L48 as well. Just got it as well. Its got a Dynomax system on it with a cat. I've been looking at doing a chambered exhaust set up. They are pretty loud. I haven't done much research on how they perform though. Not trying to hijack your thread, but does anyone have any thoughts on chambered exhausts?
Instructor
Joined: Sep 2012
Posts: 178
Likes: 17
From: South Shore Massachusetts
Le Mans Master
Joined: Apr 2008
Posts: 9,433
Likes: 239
From: Powassan ON
'78, L82. True Duals. No cats, Hooker headers, Flowmaters (don't recall which ones, no baffling), no crossover or x pipe. Unknown (possibly stock) cam. QuickFuel carb.
Vid (if it works). Don't mind the little puff of smoke. Valve seals are leaking a bit, AONTHER winter project.
Sound is a bit off as this was taken in the garage with an iPhone and it echos a bit. But it'll give you an idea.
dodosmike
Vid (if it works). Don't mind the little puff of smoke. Valve seals are leaking a bit, AONTHER winter project.
Sound is a bit off as this was taken in the garage with an iPhone and it echos a bit. But it'll give you an idea.
dodosmike
Melting Slicks
Joined: May 2012
Posts: 2,192
Likes: 343
From: Allenton Wisconsin
ajmiceli,
I'm right there with you. I have a 78 L48 as well. Just got it as well. Its got a Dynomax system on it with a cat. I've been looking at doing a chambered exhaust set up. They are pretty loud. I haven't done much research on how they perform though. Not trying to hijack your thread, but does anyone have any thoughts on chambered exhausts?
I'm right there with you. I have a 78 L48 as well. Just got it as well. Its got a Dynomax system on it with a cat. I've been looking at doing a chambered exhaust set up. They are pretty loud. I haven't done much research on how they perform though. Not trying to hijack your thread, but does anyone have any thoughts on chambered exhausts?
Le Mans Master
Joined: Feb 2011
Posts: 5,943
Likes: 61
From: Southern NH
on a stock L-48 the only exhaust that's going to give you any grunt is Flowmaster 40s or 44s. I would just take the mufflers off altogether and start from there. a low compression L-48 doesnt make that much noise
Le Mans Master
Joined: Oct 2007
Posts: 7,451
Likes: 974
From: RI, Now Franklin/Nashville TN
That sounds great with that motor. My 355 with 10.2:compression and roller cam with.525 lift sounds similar. How much lift in the cam and what compression?
Melting Slicks
Joined: Jan 2014
Posts: 2,478
Likes: 254
From: Downers Grove Illinois
If you don't need the catalytic converter then the dual exhaust from Corvette Central sounds pretty good on my '77. Sound much better than the factory exhaust. You can get them in 2 or 2 1/2 inch (2 inch for stock L48) with hideaway or Magnaflow mufflers. I have their hideaway design and like the sound, although there is a little resonance around 1500 RPM. They are surprisingly quiet on the highway with a 3.08 gear, but sound nice cruising around town.
Le Mans Master
Joined: Oct 2007
Posts: 7,451
Likes: 974
From: RI, Now Franklin/Nashville TN
There are very few states that require a cat except for the usual suspects out of step with the rest of the nation. Chances are that you do not need a cat-go with 2.5 inch duals-2.5 for maximum power and efficiency-nothing less on a 350. If you do need a cat to pass inspection, don't use the rear OEM Y pipe exhaust, if possible, but 2.5 inch duals with high flow cats-chances are no will know that it came with a 2-1-2 cat exhaust EXCEPT the usual suspect states.