side pipe inserts
Thread Starter
Burning Brakes
Joined: Feb 2014
Posts: 1,045
Likes: 226
From: Cape Neddick Maine
2020 C3 of the Year Finalist - Modified
side pipe inserts
Ok so I have read many threads on inserts for the 4.0 side pipes. Sound is a personal preference but I hope I can get some sound advice here.
I am looking into either the sts or a chambered design. My goals are some thing that I can still carry a conversation at cruise rpm and not loose a lot of performance. I know engine modifications add a little to sound so its a little 350 11:1 with a small roller cam.
I know skunk works awhile ago was going to do some dyno testing but I have not found any results. Has anyone else done any testing.
On the chambered design how much difference is there from a 2-2.25-2.5 through hole?
I have 2.5 inet side pipe now using a 69 factory muffler design from Sweet Thunder
Thanks in advance for the replies.
I am looking into either the sts or a chambered design. My goals are some thing that I can still carry a conversation at cruise rpm and not loose a lot of performance. I know engine modifications add a little to sound so its a little 350 11:1 with a small roller cam.
I know skunk works awhile ago was going to do some dyno testing but I have not found any results. Has anyone else done any testing.
On the chambered design how much difference is there from a 2-2.25-2.5 through hole?
I have 2.5 inet side pipe now using a 69 factory muffler design from Sweet Thunder
Thanks in advance for the replies.
Melting Slicks
Joined: May 2004
Posts: 2,743
Likes: 846
From: Gulf of America
2023 C7 of the Year Finalist - Unmodified
2018 C3 of Year Finalist
Been happy with my STS. Had them for years and they just keep working, all metal and nothing to wear out. Check the testimonials at the STS website for testing. I made the center tube cap removable, I uncap them at Talladega/the drags, cap them back up and drive home.
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Le Mans Master
Joined: Oct 2007
Posts: 9,702
Likes: 3,472
From: Akron Ohio
2025 Corvette of the Year Finalist - Modified
2024 C5 of the Year Winner - Modified
2023 C5 of the Year Finalist - Modified
2022 C5 of the Year Finalist - Modified
St. Jude Donor '09-'10-'11
I will be buying some STS baffles when I sell my glasspack style mufflers. I want a loud unrestricted sound though. It's a hot rod not a daily cruiser.
Racer
Joined: Feb 2009
Posts: 273
Likes: 11
From: Algona, WA
I like the classic chambered muffler. I run the 3" core version but probably too loud for your use. They do make different sizes with less hole and more packing.
I like there sound much better than my previous uncapped STS baffles. Not sure about Dyno numbers between the two but the car picked up a consistent 1.5 mph gain at the track....behind my BB coupe.
Probably going to sell the STS's they work very well, just a bit tinny.
Dave
I like there sound much better than my previous uncapped STS baffles. Not sure about Dyno numbers between the two but the car picked up a consistent 1.5 mph gain at the track....behind my BB coupe.
Probably going to sell the STS's they work very well, just a bit tinny.
Dave
Racer
Joined: Sep 2015
Posts: 250
Likes: 29
I have the spiral inserts in my OBX side pipes which was very loud. To help tame it, i ordered a roll of stainless steel muffler mesh which was like a very coarse brillo pad. I wrapped a single layer around the spiral insert and put back in place. About 8 months later it's still perfect ! Much quieter and no performance hit.
Race Director
Joined: May 2006
Posts: 18,756
Likes: 2,589
I think the key to your question is "cruise RPM" not knowing your gears I can only state I have 3.70 and tires a hair over 26" diameter. Cruise at 60 is about 3k and 70 is 3.5K. I had STS and found them at cruise to be loud and lower speeds "tinny". I switched to Sweet Thunder 2.0 and find them to have a deeper sound but by the time I get to 70 mph still pretty loud.
Thread Starter
Burning Brakes
Joined: Feb 2014
Posts: 1,045
Likes: 226
From: Cape Neddick Maine
2020 C3 of the Year Finalist - Modified
I think the key to your question is "cruise RPM" not knowing your gears I can only state I have 3.70 and tires a hair over 26" diameter. Cruise at 60 is about 3k and 70 is 3.5K. I had STS and found them at cruise to be loud and lower speeds "tinny". I switched to Sweet Thunder 2.0 and find them to have a deeper sound but by the time I get to 70 mph still pretty loud.
Race Director
Joined: May 2006
Posts: 18,756
Likes: 2,589
Le Mans Master
Joined: Mar 2001
Posts: 6,240
Likes: 1,013
From: Watkinsville, GA and Glen Cove, NY
You can also cut some of the baffles off and shorten them. At one point I was running 5 baffles uncapped. A little loud but the Dyno liked it!
Thread Starter
Burning Brakes
Joined: Feb 2014
Posts: 1,045
Likes: 226
From: Cape Neddick Maine
2020 C3 of the Year Finalist - Modified
Big brown truck came today this is my first set to arrive. I have a set of glass packs coming that I got from another member.....now just need to find a set of STS inserts then off to the dyno for testing.
Le Mans Master
Joined: Oct 2007
Posts: 9,702
Likes: 3,472
From: Akron Ohio
2025 Corvette of the Year Finalist - Modified
2024 C5 of the Year Winner - Modified
2023 C5 of the Year Finalist - Modified
2022 C5 of the Year Finalist - Modified
St. Jude Donor '09-'10-'11
Can't wait to see the results!
Racer
Joined: Nov 2007
Posts: 410
Likes: 45
From: Wisconsin Rapids wisconsin
Big brown truck came today this is my first set to arrive. I have a set of glass packs coming that I got from another member.....now just need to find a set of STS inserts then off to the dyno for testing.
Attachment 47968224
Attachment 47968224
