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1998 Seville STS / 2013 Chevrolet Impala
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Discussion Starter #1
The Walker Quiet Flow, single in dual out mufflers (for the Camaro, part number 21417.) are $39.79 (after $40 dollar rebate; regular price $79.79) at rockauto. :thumbsup:
 

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70 Deville 77 Fleet 78 Seville 92 Deville 03 Deville
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That should be the hot ticket for a Caddy; not too loud and the dual tailpipes will make the rear look more symmetrical.
 

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1998 Seville STS / 2013 Chevrolet Impala
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1,889 Posts
Discussion Starter #4
I'll be frank, the Quietflow is louder then the stock muffler. Not much louder though, think about the sound of a stock Camaro. But the walker flows much better then the stock reverse flow, and many of the Flowmaster type mufflers. The thing about the walker is that it is a straight tube with three bends in it, that is wrapped with 120 miles of fiberglass dampening. The dual out looks sweet too.
 

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'87 Coupe DeVille 4.1L FWD(New engine '08) 1981 F100 '03FXDL
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879 Posts
Different # for my car, but same thing I suppose. Dual-out. Together or at each corner?
 

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'87 Coupe DeVille 4.1L FWD(New engine '08) 1981 F100 '03FXDL
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The number for my car is a single outlet ('87 DeVille). Tried to email Walker support to ask about dimensions of the dual outlet muffler(21417), but the email link doesn't seem to work. I'd have to add the 2nd exhaust pipe from the muffler or maybe both pipes. Anyone made this change?
 

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1990 350 Brougham (The cruiser), 1988 Mark VII LSC (The DD)
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5,545 Posts
It should be very simple. It sits in the same spot as the factory muffler and the center pipe will line up properly. All you have to do is have a tail pipe made for the left hand side because they do not make one, but the right side should swap over from the factory muffler to this one with no issues.
 

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'87 Coupe DeVille 4.1L FWD(New engine '08) 1981 F100 '03FXDL
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ok, match existing pipe for opposite side...no problem. I'm concerned about the size of the exhaust-inlet. I can measure mine, but don't know what the size of the 21417 is...?
 

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1998 Seville STS / 2013 Chevrolet Impala
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Discussion Starter #10
The 21417 is 2.5" in, 2.25" out.

I know the piping on my Deville is 2.5" so that will be straight, but I'd need to make my own tips as well. I'm thinking the turn down style just like stock, but in polished stainless. :D
 

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'87 Coupe DeVille 4.1L FWD(New engine '08) 1981 F100 '03FXDL
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Hmmm...both inlet & outlet pipes are 2.25". I guess I'm sol for a dual-outlet QF
 

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'87 Coupe DeVille 4.1L FWD(New engine '08) 1981 F100 '03FXDL
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The 21417 is 2.5" in, 2.25" out.

I know the piping on my Deville is 2.5" so that will be straight, but I'd need to make my own tips as well. I'm thinking the turn down style just like stock, but in polished stainless. :D
is what your are calling 'tips' the tail-pipe? My drivers side TP would have to be fabricated because of some interference. If I buy the 21417 from RA, it will end costing $44.49 with shipping cost/RA discount/$40 Walker rebate.











444.49
 

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I want to buy the Walker dual outlet muffler for my 91 Fleetwood (Sixty Special) but I've heard some conflicting stories on which part number is the correct one. Does anyone know if the 21417 is the best application for my car. Also, want to keep it close to stock as possible so don't want any major modifications (holes) to the chassis. Thanks guys.
 

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'87 Coupe DeVille 4.1L FWD(New engine '08) 1981 F100 '03FXDL
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There are no conflicting stories. The 21417 muffler is for a Camero. Reason it was brought up was that it is a dual-outlet muffler. The stock Cadillac muffler is a single-outlet muffler. Look on the Walker website for the correct muffler for your car.
 

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Copy that Dave S Texas... but I still want dual exhaust on her so I guess the 21417 is the way to go. Hopefully it won't be much louder than the stock single exhaust on her now.
 
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