Dynomax system on box Caprice - Chevy Impala SS Forum
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post #1 of 14 (permalink) Old 01-05-2016, 07:42 AM Thread Starter
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Dynomax system on box Caprice

Will the Dynomax over-axle pipes fit a 77 4-door?
The pipes in question are Dynomax 54016 and 54017.

I want to put a 383 in the Caprice.
How do you think it will sound with 2 1/2" shorty headers, 20" Dynomax Super Turbo mufflers and dynomax resonators out back? No cats.
Basically the same setup as the Dynomax 17375 exhaust kit, but with long Super Turbo instead of 14" Ultra Flow SS.

I want a mellow idle, want to hear the exhaust when cruising or at highway, and hopefully a big growl at WOT.

A completely silent system is a waste of good V8 (so I don't want that!!), but i already have a Camaro with the Pypes Race Pro's

Kai
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post #2 of 14 (permalink) Old 01-05-2016, 08:58 AM
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Quote:
Originally Posted by CamaroKid View Post
Will the Dynomax over-axle pipes fit a 77 4-door?
The pipes in question are Dynomax 54016 and 54017......
I seriously doubt that they'll fit.....bit it's of no real consequence.

The 'heart' of an exhaust system is the mufflers anyway......an X-pipe is secondary. You should be able to take your Cappy to a muffler shop with the Dynomax mufflers of your choice and have that shop fab up a 2 1'2" system to fit......with or without a X-pipe.

Will probable have to flip for a couple of universal catalytic converters....so there's that, too.

Best of luck!

KW

1996 BBB SS, 398ci Solid Roller LT4


1995 DCM SS, LS3 w/Custom CAI, V-max 90mm TB, TSP CNC Ported Heads, Lingenfelter GT1-1 cam, Headman Mid-length Headers, 2 1/2" cat-back, 3200 Circle-D TC, 3.42 gears (for now) -- 450 HP/400 TQ To The Wheels


2014 Chevy SS; 429ci LS3 -- 508HP, 455TQ @ the wheels....After Break-in Dyno & Track Results Pending

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post #3 of 14 (permalink) Old 01-05-2016, 01:48 PM Thread Starter
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Quote:
Originally Posted by KW Baraka View Post
I seriously doubt that they'll fit.....bit it's of no real consequence.

The 'heart' of an exhaust system is the mufflers anyway......an X-pipe is secondary. You should be able to take your Cappy to a muffler shop with the Dynomax mufflers of your choice and have that shop fab up a 2 1'2" system to fit......with or without a X-pipe.

Will probable have to flip for a couple of universal catalytic converters....so there's that, too.

Best of luck!

KW
Why do you doubt that?
I have heard that my car is pretty much identical in floor/frame and suspension. Already have a 94-96 Impala SS lowering kit on it.
I was thinking more of gas tank and such.
Pypes makes the SGI10 system, and it's supposed to fit 77-96 with some driver side mods.

I'd take it to a muffler shop if they didn't charge me $1000 for parts and labor here in Norway (and still not mandrel bent pipes).
A complete fabbed up stainless system would cost me $1700 here..
With this setup, I can get away with $500.

No X-pipe mentioned in my post

No cats


So..
Do you guys think the over axle pipes will fit?
And what about sound and noise level?
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post #4 of 14 (permalink) Old 01-05-2016, 03:06 PM
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Quote:
Originally Posted by CamaroKid View Post
Why do you doubt that?
I have heard that my car is pretty much identical in floor/frame and suspension.......
Pretty much doubt that, too.

Cars are different length, width.....no way they are close to identical. If they were, the headers would be interchangeable (they're not) driveshafts would be interchangeable (they're not).

As you mentioned, position/dimension/size of gas tank is different.

Don't know who told you that the Pypes SGI10 was '77-'96....but Pypes lists it as a '94-'96 kit.....$550 without mufflers.

http://pypesexhaust.com/i-12201000-9...tem-sgi10.html

As for a muffler shop charging you $1000 for customized piping....I kinda doubt that. No way for you to really know with YOU going in for an estimate and finding out first hand.

BTW.....cats versus no cats? You will gain almost nothing by going without cats....and of course, no muffler shop will touch your car if you ain't got 'em....

Been playin' with B-bodies for 19 years.....and I'm still not ALWAYS right. But I'm pretty sure I'm right on this .....

Best of luck!

KW

1996 BBB SS, 398ci Solid Roller LT4


1995 DCM SS, LS3 w/Custom CAI, V-max 90mm TB, TSP CNC Ported Heads, Lingenfelter GT1-1 cam, Headman Mid-length Headers, 2 1/2" cat-back, 3200 Circle-D TC, 3.42 gears (for now) -- 450 HP/400 TQ To The Wheels


2014 Chevy SS; 429ci LS3 -- 508HP, 455TQ @ the wheels....After Break-in Dyno & Track Results Pending

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post #5 of 14 (permalink) Old 01-05-2016, 04:43 PM Thread Starter
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Quote:
Originally Posted by KW Baraka View Post
Pretty much doubt that, too.

Cars are different length, width.....no way they are close to identical. If they were, the headers would be interchangeable (they're not) driveshafts would be interchangeable (they're not).

As you mentioned, position/dimension/size of gas tank is different.

Don't know who told you that the Pypes SGI10 was '77-'96....but Pypes lists it as a '94-'96 kit.....$550 without mufflers.

http://pypesexhaust.com/i-12201000-9...tem-sgi10.html

As for a muffler shop charging you $1000 for customized piping....I kinda doubt that. No way for you to really know with YOU going in for an estimate and finding out first hand.

BTW.....cats versus no cats? You will gain almost nothing by going without cats....and of course, no muffler shop will touch your car if you ain't got 'em....

Been playin' with B-bodies for 19 years.....and I'm still not ALWAYS right. But I'm pretty sure I'm right on this .....

Best of luck!

KW
Didn't you scroll the page you just linked to..?

Fits the following:
- 94-96 Impala SS
- 94-96 Caprice sedan w/ 4.3L or LT1
- 94-96 Roadmaster sedan w/ 4.3L or LT1
- 77-90 Caprice and Roadmaster w/ some driver side tailpipes mods

As for the price - Jegs sells the kit for $430 without, and $477 with mufflers.

Well, doubt it as much as you want. That's the price I got quoted (8000-9000NOK, which is $920-$1035).
The stainless price was also a quote.
The shop labor costs in this country are $130-160 an hour.

Why bother buying two new cats for a car that doesn't need them?
In the 70-80's the cats were often removed on import, since all gas stations hadn't gotten unleaded fuel yet.
No shop would ever know if my car had a cat or not, so they wouldn't even blink.


Everywhere I check, it says that the frame and suspension was basically the same from 77-96.
A rear axle swaps right in, but the bolt pattern is larger on 90-96. All suspension parts interchange.
I even read about a guy that cut out the complete floor from a 94 and put into a 79. No basic changes.
The reason why the driveshafts are not always interchangeable would probably be the difference in OD vs non-OD trannys and 8.5 vs 7.5 rear axles (1" difference in axle housing depth).

From what I've read, 94-96 headers will fit a 77-90:
89 header question


BTW, I checked the wheelbase on 77 vs 96 Impala:

1977: 2946mm
1996: 2944mm


Not to push your buttons, but....

Kai

77 Caprice Classic 350 (soon to be 383/700r4/3.08)
73 Camaro Z28 GMPP383/BO700r4/3.73/2.5" Pypes Race Pro
73 BMW 3.0 CSi
00 Tahoe
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post #6 of 14 (permalink) Old 01-05-2016, 07:54 PM
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Quote:
Originally Posted by CamaroKid View Post
Didn't you scroll the page you just linked to.......
Nope....I didn't scroll all the way to the bottom.

But if you believe it's a fit.....go for it.

Me? Still skeptical.

And don't worry about my buttons....I got a thicker skin than most.

KW


EDIT: The '77 Caprice....like the '77 Bonneville that I had, did come with catalyst converters and a muffler shop will know this.

1996 BBB SS, 398ci Solid Roller LT4


1995 DCM SS, LS3 w/Custom CAI, V-max 90mm TB, TSP CNC Ported Heads, Lingenfelter GT1-1 cam, Headman Mid-length Headers, 2 1/2" cat-back, 3200 Circle-D TC, 3.42 gears (for now) -- 450 HP/400 TQ To The Wheels


2014 Chevy SS; 429ci LS3 -- 508HP, 455TQ @ the wheels....After Break-in Dyno & Track Results Pending


Last edited by KW Baraka; 01-05-2016 at 07:59 PM.
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post #7 of 14 (permalink) Old 01-05-2016, 09:21 PM
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Tailpipes will fit fine, but a full system will need a custom crossmember since the '77s were single exhaust and don't have a notch for the driver side. '90-up dual exhaust crossmember will not directly bolt on to the '77 frame. Fuel tank is a non-issue since they sit in the same spot inside the frame, and the exhaust routes on the outside of the frame in that area.


Quote:
Originally Posted by CamaroKid View Post
Why bother buying two new cats for a car that doesn't need them?
In the 70-80's the cats were often removed on import, since all gas stations hadn't gotten unleaded fuel yet.
No shop would ever know if my car had a cat or not, so they wouldn't even blink.
I thought Norway was pretty anal about car mods... You all really didn't get unleaded fuel 'til the 80s?
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post #8 of 14 (permalink) Old 01-06-2016, 05:28 AM Thread Starter
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Quote:
Originally Posted by akio View Post
Tailpipes will fit fine, but a full system will need a custom crossmember since the '77s were single exhaust and don't have a notch for the driver side. '90-up dual exhaust crossmember will not directly bolt on to the '77 frame. Fuel tank is a non-issue since they sit in the same spot inside the frame, and the exhaust routes on the outside of the frame in that area.




I thought Norway was pretty anal about car mods... You all really didn't get unleaded fuel 'til the 80s?
Thanks!
That's exactly what I needed to know!
I am prepared to cut and weld a notch in the crossmember for the driver side exhaust.

They are pretty anal, but the common knowledge of American cars is low.
My camaro is registered as completely original, and I'm basically not able to change the wheels. Special rules to get the car through inspection without having to mod the lights and other stuff.
But I have done a lot of mods, and it passes inspection every other year

I've been told that Europe were slower to get unleaded fuel than the US.
My buddy has a 84 Caprice with the cat cut off, probably from import, and it passes inspection every time.

They even removed the third brake light from the first US cars that had it, because they thought it was a traffic hazard!!

Weird country when it comes to cars..

Kai

77 Caprice Classic 350 (soon to be 383/700r4/3.08)
73 Camaro Z28 GMPP383/BO700r4/3.73/2.5" Pypes Race Pro
73 BMW 3.0 CSi
00 Tahoe
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post #9 of 14 (permalink) Old 01-06-2016, 12:14 PM
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I used those tailpipes on my '77 2-door and the were a perfect fit. I had the headers to muffler part built by a local Shop that does good work. As mentioned the trans crossmember will need to be modified to clear the new head pipe. I have found that most anything from the floorpan down is interchangeable from '77-'96.
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post #10 of 14 (permalink) Old 01-06-2016, 01:39 PM Thread Starter
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Quote:
Originally Posted by Impala77 View Post
I used those tailpipes on my '77 2-door and the were a perfect fit. I had the headers to muffler part built by a local Shop that does good work. As mentioned the trans crossmember will need to be modified to clear the new head pipe. I have found that most anything from the floorpan down is interchangeable from '77-'96.
Thanks!

Does anyone know how the system will sound?
Both the Dynomax system and Super Turbo mufflers are popular on this forum, so somebody probably uses the setup or something similar.

Kai

77 Caprice Classic 350 (soon to be 383/700r4/3.08)
73 Camaro Z28 GMPP383/BO700r4/3.73/2.5" Pypes Race Pro
73 BMW 3.0 CSi
00 Tahoe
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