"Quiet" side pipes..
07-16-2013, 04:44 PM
#1
Racer
Thread Starter
Member Since: Nov 2004
Posts: 445
Likes: 0
Received 0 Likes
on
0 Posts
"Quiet" side pipes..
..it seems that Sweet Thunder and Allens make/sell 'quiet' side pipes. Who can say which is quieter?
Does anyone have decibel readings for either?
Also, any experiences with spiral or cone shaped inserts to reduce noise levels?
Thx
Does anyone have decibel readings for either?
Also, any experiences with spiral or cone shaped inserts to reduce noise levels?
Thx
07-16-2013, 06:26 PM
#2
Race Director
Member Since: Jan 2002
Location: Close to DC
Posts: 14,560
Received 2,136 Likes
on
1,473 Posts
C2 of the Year Finalist - Modified 2020
What did you say? Couldn't hear 'ya! 
Dennis
Dennis
07-16-2013, 07:11 PM
#3
Melting Slicks
What is the reason? I ask because if I wanted it truly quieter I would run a switch with pipes running out back, probably curved down behind where the stock holes would be so you can barely see them. The tech could be taken from c6 npp or other and just custom fitted. Boats have had similar technology for years too (I have corsa switchable on my boat)
This is an option that will work well vs maybe kinda work. Side pipes are loud partially from the location.
This is an option that will work well vs maybe kinda work. Side pipes are loud partially from the location.
07-16-2013, 08:00 PM
#4
Safety Car
Member Since: Sep 2004
Location: St. Clair Shores MI
Posts: 4,050
Received 132 Likes
on
74 Posts
C2 of Year Finalist (track prepared) 2019
2017 C2 of the Year Finalist
I see this question all the time, but I never heard of a guy looking for a quieter woman to sleep with.........
viscerally, they are the same
viscerally, they are the same
07-16-2013, 08:15 PM
#6
Racer
These are Quick time electric cutouts with a crossover pipe. Ive been to a few shows now and no one has even noticed.
07-16-2013, 09:01 PM
#7
Team Owner
Very nice setup SS409
06-05-2017, 05:41 PM
#9
Why is the crossover pipe necessary?
06-05-2017, 05:45 PM
#10
Team Owner
Member Since: Dec 1999
Location: Florida
Posts: 26,488
Received 258 Likes
on
172 Posts
2021 C2 of the Year Finalist - Modified
C2 of the Year Finalist - Modified 2020
C2 of Year Finalist (performance mods) 2019
St. Jude Donor 03-'04-'05-'06-'07-'08-'09-10-'11-'12-'13-'14-'15-'16-'17-'18-'19-'20-'21-'22-'23-'24
The best thing about side pipes is they look so cool. There is not much to like after that. 
06-05-2017, 06:04 PM
#11
Race Director
Member Since: Feb 2007
Location: northern california
Posts: 13,633
Received 6,548 Likes
on
3,012 Posts
C2 of Year Finalist (track prepared) 2019
Spiral inserts do actually reduce the sound level significantly but whether or not they could be called "quiet" is a matter for the listener to decide.
My vintage racer (in avatar) has 3" side pipes with spiral inserts from Spiral Turbo Specialties. I have to run some kind of muffling to meet sound limits at area tracks and these get me by 99% of the time, even at Laguna Seca. (Laguna Seca has sound limits so severe that some factory stock, stone quiet street cars exceed their threshold). Jim at STS is easy to deal with and makes a good product.
Jim
06-05-2017, 06:24 PM
#12
Team Owner
Member Since: Oct 2004
Location: altered state
Posts: 81,242
Received 3,043 Likes
on
2,602 Posts
St. Jude Donor '05
No such thing
They sure get quiet once the wedding cakes gone.
but I never heard of a guy looking for a quieter woman to sleep with.
Last edited by cv67; 06-05-2017 at 06:26 PM.
06-05-2017, 10:16 PM
#15
Burning Brakes
Exhaust Set-Up
What an incredibly nice set-up. I am soooo jealous!
I've been thinking of getting an H-pipe. From your experience, what are the pros and cons of installing one on a C-2? Thanks!!!
I've been thinking of getting an H-pipe. From your experience, what are the pros and cons of installing one on a C-2? Thanks!!!
06-06-2017, 01:52 PM
#17
Race Director
Member Since: Mar 2001
Location: Mustang OK
Posts: 13,852
Received 3,773 Likes
on
1,674 Posts
2023 C1 of the Year Finalist - Modified
2015 C1 of the Year Finalist
I have NEVER understood the reasoning behind having quiet side pipes. If I could get away with it, I'd run open headers all the time----------------------------but I don't care to pay for all the tickets.
So far, the locals haven't given me any grief with the T-bucket!
So far, the locals haven't given me any grief with the T-bucket!
06-06-2017, 02:55 PM
#18
Racer
i bought the allens "super quiet" pipes. they sound awesome, nice mellow rap while accelerating. i could easily have a conversation with a passenger travelling 80mph with the top down.
06-06-2017, 03:37 PM
#19
Team Owner
Member Since: Oct 2004
Location: altered state
Posts: 81,242
Received 3,043 Likes
on
2,602 Posts
St. Jude Donor '05
Like open headers, too
Day I drove mine to the muffler shop dug it!
We get spoiled by late model cars being whisper quiet these old tanks werent quiet when new every car had its distinct sound
Day I drove mine to the muffler shop dug it!
We get spoiled by late model cars being whisper quiet these old tanks werent quiet when new every car had its distinct sound
06-06-2017, 04:01 PM
#20
Racer
I installed the H pipe primarily because I have the exhaust crossover ports on my intake manifold blocked off and without the H pipe I would have had to deal with that lousy popping sound usually heard when deccelerating. There are other benefits to using one. I'm sure someone else here will elaborate further.