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Old 10-30-2019, 05:11 PM
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Mike S Mike S is offline
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Default need 3.5" muffler recomendation

I have been running Dyno max ultra flows full case mufflers for the last few years. I bought the stainless steel ones thinking they would last for a long time. The dam inner perforated tube is regular steel. Guess what rusted out and tried to make it's way out of the muffler along with fiberglass.
My 10.0 index class requires mufflers so have to get new ones. Anyone know of ones that are stainless steel throughout? I was looking at Magna Flow"s.

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Old 10-30-2019, 05:28 PM
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I'm pleased with the Pypes Race Pro 3.5" on mine. I cannot say if they are stainless throughout.

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'68 Firebird

463/pump gas/SD 325 E-heads/266-272 SR cam/1050 Dominator/3.73/ET Street Radials/1.37 60'/6.30@108.80/9.93@135.14

Hot Rod Drag Week finishing averages:
2014 - 11.12 @ 118.56
2015 - 10.84 @ 124.97
2016 - 10.56 @ 127.88
2017 - 10.29 @ 130.74
2018 - 10.29 @ 130.53
2019 - 10.16 @ 132.34
2021 - 10.09 @ 132.69
2022 - 10.13 @ 133.07

9.93 run - https://youtu.be/hII0_UlYM4U

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Old 10-30-2019, 06:14 PM
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GTO FIREHAWK JOHN GTO FIREHAWK JOHN is offline
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Default Pypes 3.5 race flow

I as well have the race flow & actually really like the sound
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Old 10-30-2019, 06:40 PM
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I was told the Pypes Race Flow had the quietest sound...

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Old 10-30-2019, 07:21 PM
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Here's a video of mine. basically 4 ft. of 3 1/2" straight pipe, 3 1/2" Race Pro mufflers and turn down/outs. You should be able to pick the sound of my car out from the other car.

https://youtu.be/VK8C7I4yMnA

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'68 Firebird

463/pump gas/SD 325 E-heads/266-272 SR cam/1050 Dominator/3.73/ET Street Radials/1.37 60'/6.30@108.80/9.93@135.14

Hot Rod Drag Week finishing averages:
2014 - 11.12 @ 118.56
2015 - 10.84 @ 124.97
2016 - 10.56 @ 127.88
2017 - 10.29 @ 130.74
2018 - 10.29 @ 130.53
2019 - 10.16 @ 132.34
2021 - 10.09 @ 132.69
2022 - 10.13 @ 133.07

9.93 run - https://youtu.be/hII0_UlYM4U

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Old 10-30-2019, 08:03 PM
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I love the spin tech rumble

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Old 10-30-2019, 08:31 PM
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Quote:
Originally Posted by firechickenman View Post
Here's a video of mine. basically 4 ft. of 3 1/2" straight pipe, 3 1/2" Race Pro mufflers and turn down/outs. You should be able to pick the sound of my car out from the other car.

https://youtu.be/VK8C7I4yMnA
Were you in the Subaru? Very impressive signature. That's some exhaust at 3.5", have you run a 3" exhaust with your current combo?

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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule.
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Old 10-30-2019, 10:44 PM
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Do the Pypes race flow mufflers choke down inside? I want to make sure they are a full 3.5 inside.. If they do I might try them this time.

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Old 10-30-2019, 11:12 PM
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Quote:
Originally Posted by AG View Post
Were you in the Subaru? Very impressive signature. That's some exhaust at 3.5", have you run a 3" exhaust with your current combo?
Thanks! I went straight from my 2 1/2" Flowmaster system to this 3 1/2" setup. The 2 1/2" system really killed the ET.

Quote:
Originally Posted by Mike S View Post
Do the Pypes race flow mufflers choke down inside? I want to make sure they are a full 3.5 inside.. If they do I might try them this time.
I'm pretty sure they are the same size inside as the 3 1/2" pipe. If they weren't, I would have made a mental note about the reduction. My car is about .08 quicker when I take the mufflers off which is probably only 20 lbs weight so they do cost me a few HP.

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'68 Firebird

463/pump gas/SD 325 E-heads/266-272 SR cam/1050 Dominator/3.73/ET Street Radials/1.37 60'/6.30@108.80/9.93@135.14

Hot Rod Drag Week finishing averages:
2014 - 11.12 @ 118.56
2015 - 10.84 @ 124.97
2016 - 10.56 @ 127.88
2017 - 10.29 @ 130.74
2018 - 10.29 @ 130.53
2019 - 10.16 @ 132.34
2021 - 10.09 @ 132.69
2022 - 10.13 @ 133.07

9.93 run - https://youtu.be/hII0_UlYM4U

  #10  
Old 10-31-2019, 12:29 AM
Mark G Mark G is offline
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I have a pair for sale.

http://www.dynomax.com/mufflers/ultr...elded-mufflers

Good for 2000 hp

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Old 10-31-2019, 12:46 AM
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I have 3 1/2" Borla's as far as i know there stainless all the way through. Been on my car since 2006. No rust on them..

https://www.summitracing.com/parts/bor-40946/overview/

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Old 10-31-2019, 01:22 AM
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The single FlowMaster 40-series on the Bandit is the same one Wangers put on it at least 13 years ago- not stainless, but long lasting. It's 3.5" in and 3.0" out.

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  #13  
Old 10-31-2019, 11:12 AM
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After 2 sets of Flowmaster rusting, I went with Borla's more than 15 years ago

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Old 10-31-2019, 05:02 PM
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I’m a Spin Tech as well. Sounds like a 60 Indy Car

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Old 10-31-2019, 06:07 PM
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Spintech x 3

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Old 10-31-2019, 10:12 PM
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Quote:
Originally Posted by firechickenman View Post
Thanks! I went straight from my 2 1/2" Flowmaster system to this 3 1/2" setup. The 2 1/2" system really killed the ET.



I'm pretty sure they are the same size inside as the 3 1/2" pipe. If they weren't, I would have made a mental note about the reduction. My car is about .08 quicker when I take the mufflers off which is probably only 20 lbs weight so they do cost me a few HP.
I love your car because it's very similar to my race car and what you are doing with it. What changes did you make between 2018 and 2019 drag week to pick up ET and mph?

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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule.
  #17  
Old 10-31-2019, 10:29 PM
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We have the Magnaflows on Jakes car. 3.5” in/out. Forgot the number. They are very short. We have an X pipe also. Sounds great. Haven’t had any issues rusting out. Been on the car since 2014.

Brian

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Old 10-31-2019, 11:03 PM
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I have 3" Flowmaster 50 series. They are very long and took some work to make fit. I have the Aluminized version not stainless. But they are 11 years old and in great shape with no rust. Love the sound of Flowmasters.

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Old 10-31-2019, 11:23 PM
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https://youtu.be/8QMmYxJy0hQ. Link to my Firebird in the burn out

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Old 11-01-2019, 12:17 AM
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For performance i would never choose a chamber type muffler (spin tech & Flowmaster), a straight through design is better for performance. I ran the Pypes race mufflers and ran 9.0s, i tried with and without the exhause and even though the car was 50lbs lighter without the exhaust it ran almost the same et/mph. I don't know how long they'll last but performance wise they were great.

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