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Topic: Ballanced dual exhaust

in Forum: C3 Fuel, Emission Control, and Exhaust Systems

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Ballanced dual exhaust (1/15)
6/24/09 4:45am

Aussie79vette
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, - Australia

Vette(s):
1979 corvette

Joined: 5/15/2009
Posts: 28

Hi guys, after the success of finding someone to send my new tyres to me in Aus, I am now looking for a new dual ballanced exhaust.

I want to replace the origanal exhaust on my 79 (with added bonus of getting rid of the cat) with a dual one and looked at most of the exhaust sites but they don't seem to have a system were the 2 front pipes are joined a couple of feet back from the manifold, thus making it a ballanced exhaust. This also helps stopping the resonating of the exhaust thru to the cabin.

I have been quoted $AU1200.00 Cry

Cry

($US954.00) to manufactor one here, with muffler's, but this seems alot when the prices are so cheap in the USA.

1--Has anyone seen a dual exhaust like this.

2-- What is a good muffler to use with a new dual exhaust

Thanks in advance

Andy from down under

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Ballanced dual exhaust (2/15)
6/24/09 6:28am

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HOWELL, NJ - USA

Vette(s):
1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.

Joined: 5/18/2004
Posts: 6812

G'day Andy,

The stock crossmember on a 79 has the passthrus for the dual exhaust primaries, making it fairly difficult to do a crossover closer to the engine. I have seen a custom "X-pipe" flanged in behind the trans crossmember and the guy had mixed feelings between the benefits vs hassles...

As far as mufflers, there are a lot of good manufacturers out there. I have staright pipes (2 1/2") with flowmasters - love the sound and performance.

Good luck! Let us know how you make out.

Paul

Ballanced dual exhaust (3/15)
6/24/09 3:01pm

KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484

Hey Andy from down under,

I've got a true dual system on my '79. I got it from Mid America Motorworks (www.mamo.com).

I briefly considered trying to get an X-Pipe set up for mine but learned that the relatively low horsepower in the '79 would not allow for a noticeable performance benefit.

I recently upgraded to Magnaflow mufflers on this true dual system and I'm very happy with the result!

Let us know what you go with.

Kevin

Ballanced dual exhaust (4/15)
6/24/09 5:29pm

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Waterford, MI - USA

Vette(s):
1973 Red coupe

Joined: 9/13/2002
Posts: 1735

I had a local muffler shop cut in a H-pipe on my 73. It is mounted just behind the crossmember. All they did was cut a hole in the side of the pipes and weld in a piece between them. I don't know if it really did anything but it only cost me $20.

Redwingvette2009-06-24 14:30:24

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73 coupe L48, Flat-top pistons, Performer RPM Heads, Crane Cam and roller rockers, Holley 650 vac sec. Performer intake,
3.55 gear BTO 200-4R trans,
Leather seats, Seatbelt Plus 3point seatbelts, Pioneer CD player
Magnaflow Exhuast System

Dewitt radiator and dual electric fans

Borgeson Steering box

Ballanced dual exhaust (5/15)
6/24/09 6:12pm

indy99
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Newport, MI - USA

Vette(s):
1980 L-48 still in the middle of a frame-off.

Joined: 6/9/2005
Posts: 932

I also went with a true dual stainless steel pipe set-up from MAM. I decided to go with the KBD twin tip mufflers. So far I am pleased with the results. Here is a short video I made. The audio is not the greatest but it sounds much better in person. It has a deep throaty growl at idle, smooths out at higher rpms and roars when you get on it.

http://www.youtube.com/watch?v=Q1Ku3FBbk9w

indy992009-06-24 15:18:12

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Ballanced dual exhaust (6/15)
6/24/09 7:59pm

VetteSpecialties
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Mounds View, MN - USA

Vette(s):
70 LT1 coupe, 69 350 HP coupe, 69 390HP 427 coupe, 71 LS5 convert, 85 coupe, 93 coupe

Joined: 5/24/2007
Posts: 1031

The '74 system is a bolt in if you have a four speed, and you only need to change the center hanger if you have an automatic. Or you can modify your existing center hanger by welding an additional hanger on the other side. We sell the Allens system. We sell at least ten times as many aluminized systems as stainless. They are quieter, easier to work with, and considerably cheaper. We get $379.00 for a complete system including donuts and clamps. I agree with the comments about there not being a measurable benefit to adding the connecting "H" pipe unless you are making a lot of horsepower.

Larry

Ballanced dual exhaust (7/15)
6/25/09 2:14am

Aussie79vette
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, - Australia

Vette(s):
1979 corvette

Joined: 5/15/2009
Posts: 28

Thanks for the feed back, I agree it may not be worth the effort to get the H-PIPE, just a whole lot easier to get a true dual.

Still waiting to get my tyres from the US and make sure there are no hidden costs that will blow the budget, if all ok then will look a bit deaper.

Andy from down under

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Ballanced dual exhaust (8/15)
6/25/09 12:05pm

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COPPERAS COVE, TX - USA

Vette(s):
1972 corvette stingray convertible 2007 coupe

Joined: 7/6/2002
Posts: 417

I have true duals with magnaflow mufflers, had a local shop cut in a cross over just behind tranny. Just like Brian it only cost a few bucks to have it done.

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Ballanced dual exhaust (9/15)
6/27/09 11:05pm

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Manteca, CA - USA

Vette(s):
1978,two tone,Metalic Rootbeer & gold 1975 L48 4 speed

Joined: 11/20/2005
Posts: 3623

Hi Andy, I'm a "Magnaflow" (for mufflers) fan, but I wouldn't worry about the crossover pipes myself, just not enough gain to be worthwhile. Good luck.

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Ballanced dual exhaust (10/15)
6/28/09 12:02am

anips
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sonoma, CA - USA

Vette(s):
72 LT-1 AC coupe,69 l-36 coupe

Joined: 8/9/2002
Posts: 784

hey Kdaddy, clicked on the link you left and its some floral design outfit in Honolulu, Hawaii, awa,awa, awa??

Ballanced dual exhaust (11/15)
6/28/09 10:44am

KDADDY79
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484

Sorry 'bout that Andy.

Here it is;

www.mamotorworks.com

You might also want to check with Corvette Specialties (right here at C3VR) for a system that comes complete with the mufflers. If I had to do it again, I'd go that route.

Kevin

Ballanced dual exhaust (12/15)
6/28/09 3:23pm

bio11
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Oklahoma City, OK - USA

Vette(s):
1972 LS5 Convertible,Auto.Targa Blue with Black Interior.

Joined: 4/1/2007
Posts: 432

After reading this I'm thinking about having my local muffler guy cut in a crossover to maybe smooth out the sound and eliminate some of the popping. My Big Block with Headers, I get a little popping sometimes. Do you guy's think this would make it sound a little smoother.

Ballanced dual exhaust (13/15)
6/28/09 3:51pm

anips
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sonoma, CA - USA

Vette(s):
72 LT-1 AC coupe,69 l-36 coupe

Joined: 8/9/2002
Posts: 784

Here where I live in the Socialist Republic of Kalifornia USA, my friend owns a muffler shop, for a 21/2" alumn. system with Flow's or any upper end mufflers you desire and SS tips is just about the same price $AU1200-$US950.. now if you live out in the mid west prices are a little cheaper, whats $100 one way or another, what you might want to think about is if you buy a system from the US, you might save a couple $, don't forget shipping, but what if the system you bought from the US is not made correctley, or maybe the dock worker drove a fork lift over it, and it does happen, are you going to send it back or wait to collect the ins. money, if that were to be the case that $AU1200 local muffler shop price wouldn't look so bad. Ermm .....BTW, Larry's is a killer deal no doubt about it, most muffler shops can not compete specially here in Calif, my friend told me his cost for parts alone was more than the complete after market sys, the after market sys that I bought and installed on the LT-1 was made dead nuts, , the only part he made for me was a double flanged 3" to 21/2" collector reducer, so I could drop the collector reducer to have room to pull the short primary out of the secondary pipe, I have under car Hookers and if you weld the primary pipe directly to the reducer like most shops do you have to pull the headers or cut the weld at the reducer- primary pipe to be able to pull the exh system to be able to pull a 4-speed.

anips2009-06-28 23:04:13

Ballanced dual exhaust (14/15)
6/28/09 4:24pm

anips
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sonoma, CA - USA

Vette(s):
72 LT-1 AC coupe,69 l-36 coupe

Joined: 8/9/2002
Posts: 784

Bio, if you get popping through the exh the cause's could be a over rich condition in the carb, if you run a smog pump it could be a bad "gulper" valve, or loose header bolts or a bad header or collector gasket, if air is drawn into the sys. between the head and header flange you may get a pop through the exh or at the flange, as far as the bal. tube, I can't see cutting one in just aft of the trans crossmember would cause a problem, besides where else would you put one, just make sure your sys is hanging correctley before cuttin in the tube........I meant the muffler sys! anips2009-06-28 19:10:48

Ballanced dual exhaust (15/15)
6/28/09 4:54pm

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COPPERAS COVE, TX - USA

Vette(s):
1972 corvette stingray convertible 2007 coupe

Joined: 7/6/2002
Posts: 417

It will stop the popping, sound much smoother. Had the same thing going on and it smothed it right out with a nice mellow tone untill I hammer it Big smile

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