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Founder, 1929-2014
Speedy Bill
Since 1952
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Mufflers for 20 Inch Extensions

Specs
Material Type:
Steel
Overall Length:
7.00
Sold in Quantity:
Pair
Finish:
Natural
Inside Diameter:
1.90
Outside Diameter:
3.35
Garage Sale:
No
Mufflers for 20 Inch Extensions

Click image to enlarge

Please NOTE the following about this product:

  • This item is sold as a pair.

Details

Reviews

Q & A

What's in the Box

Designed to slip inside extensions. Unique baffle system wrapped with fiberglass gives headers street legal performance. (Not legal in California.)

Customer Reviews

Rated 4.1 out of 5 by 11 reviewers.
RATING BREAKDOWN
11 reviews
5 Stars
6
4 Stars
2
3 Stars
2
2 Stars
0
1 Star
1
RECOMMEND THIS PRODUCT:

Krag
Verified Purchaser
Colorado, USA
Product Rating

Mufflers

October 01, 2014
These really helped quit my headers the auger mufflers helped a little adding these did the trick
Yes, I recommend this product.
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blackholeracing
Verified Purchaser
Winslow AZ.
Product Rating

I would buy this again

September 16, 2012
used this product on a 350 chevy trike much more plesant to ride after reducing the noise level
Pros:
  • Made Exhaust Legal
  • This Is An Easy Install
Yes, I recommend this product.
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streetrod guy
Verified Purchaser
cape coral florida
Product Rating

they work great

November 11, 2010
This is the second vehicle I have used them on. They give you the look of open headers and quiet them down enough to be streetable.
Pros:
  • Inexpensive easy to inst
Yes, I recommend this product.
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Super 5
Verified Purchaser
Golden Valley, Arizona
Product Rating

Good Fit, not much effect

September 17, 2010
I tried these mufflers on my 600 HP Super Stock Circle Track Car. The effect was minimal. Perhaps on a lower HP engine they would be more effective.
Pros:
  • Fit very nice
  • Good Quality
No, I would not recommend this product.
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Bad Attitude
Verified Purchaser
Lingle
Product Rating

ear muffs

October 22, 2010
easyyyyyyyyyyyy
Yes, I recommend this product.
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GB
Verified Purchaser
Port Charlotte, FL
Product Rating

Pleasantly surprised!

October 07, 2011
When I received these inserts, I really didn't think they would cut the sound much. Boy, was I surprised! They sound mellow, like glass packs should, while my T-bucket still retains the exhaust appeal. I had to make an installation tool from a pice of 3" PVC pipe to drive the inserts into the extensions. This made the install simple. Great product, great price.
Pros:
  • Easy To Install
  • Wife likes the sound
  • Great Sound
Yes, I recommend this product.
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jr7402
Verified Purchaser
Indiana
Product Rating

too much whiz not enough bang

March 22, 2012
The mufflers are to hard to install. could mar finish of pipes thay are put in.
Pros:
  • Great Sound
No, I would not recommend this product.
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DennisTBuck
Verified Purchaser
Product Rating

Great sound!!

October 12, 2014
Didn't use in the 20 in extensions. Used the seven inch turnouts. A little sanding on diameter to get a snug fit in the header, with just enough space to install turnout. Sounds good with a good rumble on my T-Bucket.
Pros:
  • Easy Install
  • Nice sound
Yes, I recommend this product.
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Gus1953
Product Rating

Very poor features.

September 08, 2013
I had to call Speedway tech support to determine which direction the muffler goes in. No instructions within the shipping box. Tech support said it could be installed in either direction. I tried both directions, made no reduction in db noise. I do not recommend this product at all. $39.99 x 2 each. Waste of time and money.
No, I would not recommend this product.
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GB
Verified Purchaser
Port Charlotte, FL
Product Rating

Pleasantly surprised!

October 07, 2011
When I received these inserts, I really didn't think they would cut the sound much. Boy, was I surprised! They sound mellow, like glass packs should, while my T-bucket still retains the exhaust appeal. I had to make an installation tool from a pice of 3" PVC pipe to drive the inserts into the extensions. This made the install simple. Great product, great price.
Pros:
  • Wife likes the sound
  • Great Sound
  • Easy To Install
Yes, I recommend this product.
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Page 1 of 2
91013102

Product Q&A

10 questions : 11 answers

1 answers

Can the Muffers For Extensions Be cut Shorter to fit The Auger style not workihg well for the weld I had to do.

HaulZit
Hixson, Chattanooga, TN, USA
August 17, 2014

Can the Muffers For Extensions Be cut Shorter to fit The Auger style not workihg well for the weld I had to do.

Answers

August 18, 2014
EricM
You could possibly cut these down and weld them back together to get the length that you want.
1 answers

lake style exhaust mufflers I want to install Lake style exhaust #9300550H on my Roadster but i'm having a problem finding mufflers. I don't want to run open headers and feel some back pressure is important as well. Will this muffler work and if not do you have any suggestions? Thank you, Frank

limo44
Gap, PA, USA
July 23, 2014

lake style exhaust mufflers I want to install Lake style exhaust #9300550H on my Roadster but i'm having a problem finding mufflers. I don't want to run open headers and feel some back pressure is important as well. Will this muffler work and if not do you have any suggestions? Thank you, Frank

Answers

July 23, 2014
EricM
These will not fit the tapered cone of a lake style header. Sorry I do not offer mufflers for that application. Backpressure is not important, that is a myth. You will see some magazine articles where they gain power by adding mufflers. That is an indication of a camshaft that is wrong for the application and typically has too much duration with an incorrect lobe separation angle.
1 answers

How long are these baffles?

TexasT
Austin, TX
December 27, 2013

How long are these baffles?

Answers

December 28, 2013
EricM
These mufflers are 7" long.
1 answers

haw are they installed and removed from the extensions?

Customer # 1445731
Albuquerque, New Mexico
March 21, 2011

haw are they installed and removed from the extensions?

Answers

March 24, 2011
Zach
These mufflers are meant to fit inside our header extensions http://www.speedwaymotors.com/Slip-Over-Extensions,1720.html. They are retained inside the extension and won't slip or move because the extension has a turnout on it. you might be able to use these in a straight pipe by putting some set screws on the back side to keep them from moving.
1 answers

is this sold as a pair or each

September 24, 2011

is this sold as a pair or each

Answers

September 27, 2011
Jason
These are sold as a pair
1 answers

I see the review is there much sound reduction

September 24, 2011

I see the review is there much sound reduction

Answers

September 27, 2011
John
These slip in mufflers offer considerable noise reduction. There is not a percentage or decibel figure available as there are so many contributing factors that influence the noise level along with personal preference. In some instances customers have used two of the shorter mufflers on each side and run one part way into the collector header for additional muffling.
1 answers

Would it be a good idea to weld them in?

Dale
Garland, TX (Dallas area)
December 31, 2011

Would it be a good idea to weld them in?

Answers

January 03, 2012
John
Part # 91013102 These mufflers are a fairly secure fit in our extensions and should NOT require welding in place. Install with the open end of the louver facing the rear of the car to prevent exhaust flow restriction.
1 answers

For the best sound and long life, which direction should I install the glasspaks? exhaust flow over the louvers or gas flow into the louvers? Thanks, Ralph

Castle Rock, Colorado
December 27, 2011

For the best sound and long life, which direction should I install the glasspaks? exhaust flow over the louvers or gas flow into the louvers? Thanks, Ralph

Answers

December 29, 2011
John
Part number 91013102 The exhaust flow needs to go over the louvers and NOT into the louver. The opening should face the rear or exit on the extensions.
1 answers

Is there any reason one cannot run the shorter mufflers in the longer 26" extentions and are they comparable in the level of sound?

Cincinnati Ohio
December 08, 2011

Is there any reason one cannot run the shorter mufflers in the longer 26" extentions and are they comparable in the level of sound?

Answers

December 08, 2011
Zach
Speedway part number 91013102. You can run the short mufflers in the long extensions, but they may move if you don't put some set screws to retain them. The short ones will be a bit louder.
2 answers

Which end goes in first? Which end goes in first?

Bill
Shreveport, LA, USA
October 08, 2012

Which end goes in first? Which end goes in first?

Answers

September 09, 2013
Gus1953
Per Speedway Tech support, either end could be installed first.
October 09, 2012
Jason
Part number 91013102 The exhaust flow needs to go over the louvers and NOT into the louver. The opening should face the rear or exit on the extensions
Page 1 of 1

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How It Works (JPEG)