true duals

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May 11, 2005 | 10:56 PM

78 anny vette

Thread Starter

Heel & Toe

Joined: Feb 2005

Posts: 16

Likes: 0

true duals

I`m having true duals put on my 78 l48. Will i need heat sheilds under the floor pan. I don`t have headers yet.

May 11, 2005 | 10:58 PM

bobs77vet

Race Director

Joined: Sep 2004

Posts: 11,874

Likes: 263

From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod

Quote:

Originally Posted by 78 anny vette

I`m having true duals put on my 78 l48. Will i need heat sheilds under the floor pan. I don`t have headers yet.

with or with out cats? you may want them with cats...no cats no shields necessary

May 11, 2005 | 11:08 PM

MYBAD79

Le Mans Master

Joined: Oct 2004

Posts: 5,269

Likes: 54

From: Orlando Florida

St. Jude Donor '05

well...... it's getting pretty hot at your feet..... at least that's my experience....
BTW, I don't have A/C and I live in FL.... may not be that big of a problem for you, depends where you live...

May 11, 2005 | 11:17 PM

78 anny vette

Thread Starter

Heel & Toe

Joined: Feb 2005

Posts: 16

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thanks for the help. No cats and I`m in the land of 10,000 lakes

May 11, 2005 | 11:43 PM

MsVetteMan

Melting Slicks

Joined: Jan 2005

Posts: 3,028

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From: Madison Ms

It's a big difference if your dropping the cats and going "true" dual exhaust at the same time! You will be suprised..........

EDIT: FROM A POWER STANDPOINT........

Last edited by MsVetteMan; May 11, 2005 at 11:46 PM.

May 11, 2005 | 11:44 PM

bobs77vet

Race Director

Joined: Sep 2004

Posts: 11,874

Likes: 263

From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod

Quote:

Originally Posted by 78 anny vette

thanks for the help. No cats and I`m in the land of 10,000 lakes

i don't think you have an issue, however any anything to keep the heat out is a good idea.

May 12, 2005 | 05:59 AM

djgrelli

Racer

Joined: Dec 2003

Posts: 304

Likes: 0

From: Pasadena Maryland

I'm running true duals and no cat on my 78. Actually is cooler in the passenger compartment. What a difference in performance.

May 12, 2005 | 06:04 AM

foundvettelifeisgood

Melting Slicks

Joined: Apr 2001

Posts: 2,119

Likes: 213

From: Pittsburgh PA

Quote:

Originally Posted by 78 anny vette

I`m having true duals put on my 78 l48. Will i need heat sheilds under the floor pan. I don`t have headers yet.

If it's not too late, do the headers at the same time. I wasted the extra dough doing it in 2 stages.

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May 12, 2005 | 06:11 AM

78 anny vette

Thread Starter

Heel & Toe

Joined: Feb 2005

Posts: 16

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I have plans to upgrade motor over the winter,at that time i willadd headers. Thanks for info.

May 12, 2005 | 12:20 PM

#10

mvftw

Melting Slicks

Joined: Feb 2003

Posts: 2,331

Likes: 6

From: Long Island NY

Have them install an H-Pipe also, plus you should go with 2 1/4" not 2 1/2"...

May 12, 2005 | 01:08 PM

#11

bobs77vet

Race Director

Joined: Sep 2004

Posts: 11,874

Likes: 263

From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod

Quote:

Originally Posted by mvftw

Have them install an H-Pipe also, plus you should go with 2 1/4" not 2 1/2"...

did you mean this the other way around? i recommend 2 1/2" for sure

May 12, 2005 | 01:20 PM

#12

mvftw

Melting Slicks

Joined: Feb 2003

Posts: 2,331

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From: Long Island NY

Rule-of-Thumb is over 300hp go with 2 1/2". A stock L48 or L82 will preform better with 2 1/4" duals...

May 12, 2005 | 01:46 PM

#13

bobs77vet

Race Director

Joined: Sep 2004

Posts: 11,874

Likes: 263

From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod

Quote:

Originally Posted by mvftw

Rule-of-Thumb is over 300hp go with 2 1/2". A stock L48 or L82 will preform better with 2 1/4" duals...

MVFTW...ok i see where you are going....

78 anny vette....make up your mind now on what kind of power you want before you spend $$$ on the exhaust....

May 12, 2005 | 02:31 PM

#14

djcwardog

Burning Brakes

Joined: Apr 2003

Posts: 844

Likes: 0

From: Central KY

For those who add heat shields for the duals... parts to buy or fabbed by a muffler shop?

May 12, 2005 | 04:49 PM

#15

Ak. Mal

Race Director

Joined: Oct 2000

Posts: 11,891

Likes: 3

From: Kansas City, MO ...I'd like to go fishing and catch a fishstick. That'd be convenient. - Mitch Hedberg

I've got headers and dual exhaust. Driving around under 50 mph, no heat in the footwells. 50-65 mph, starts getting warm. Anything over 65 mph and my feet start to cook.

I'm gonna fab up some heat shields. I'm going to cut some long sheet metal, then bend a radius into it. Then I'll cut out the tabs and tack weld it to the exhaust pipes.

May 12, 2005 | 06:21 PM

#16

oregonsharkman

Melting Slicks

Joined: Aug 2004

Posts: 2,165

Likes: 950

From: Keizer Oregon

Quote:

Originally Posted by mvftw

Rule-of-Thumb is over 300hp go with 2 1/2". A stock L48 or L82 will preform better with 2 1/4" duals...

??? I say go with 2 1/2" either way.....the only thing you will lose with 2.5' on a stock motor is a "bit" of bottom end torque, but you can always run more restrictive mufflers if needed

If you install 2.25 and then later decide to upgrade the power, you have to buy an entirely new exhaust system.