Chambered Exhaust and Performance Question
#1
Pro
Thread Starter
Chambered Exhaust and Performance Question
I'm thinking of installing an Allen Chambered Exhaust on my '68 327 Roadster with 4 speed.
Is there a performance gain or decrease with using the chambered exhaust?
I put one on my previous '74 with a 350 and 4 speed but did not have it long enough after the install to notice any gain or loss of power. Did sound awesome though. Even set off some car alarms when passing by
Is there a performance gain or decrease with using the chambered exhaust?
I put one on my previous '74 with a 350 and 4 speed but did not have it long enough after the install to notice any gain or loss of power. Did sound awesome though. Even set off some car alarms when passing by
#2
Former Vendor
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Location: Jeffersonville Indiana 812-288-7103
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St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
I'm thinking of installing an Allen Chambered Exhaust on my '68 327 Roadster with 4 speed.
Is there a performance gain or decrease with using the chambered exhaust?
I put one on my previous '74 with a 350 and 4 speed but did not have it long enough after the install to notice any gain or loss of power. Did sound awesome though. Even set off some car alarms when passing by
Is there a performance gain or decrease with using the chambered exhaust?
I put one on my previous '74 with a 350 and 4 speed but did not have it long enough after the install to notice any gain or loss of power. Did sound awesome though. Even set off some car alarms when passing by
Oh... I carry Mike's systems and wholesale them too Give Tommy a call at 812-288-7103.
Willcox
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marshal135 (09-25-2017)
#3
Safety Car
Chambered Exhausts Just sound awesome
Hello there,
I have two Corvettes and both of them have Chambered exhaust systems on them. On my 1968 BB it sounds like side pipes but the noise is behind you instead of next to your door. It sounds very nice but I can't say whether it helped or hurt my power output.
On my C4, a 1988 Coupe with the stock L98 It helped my mileage on the highway a bit. I was able to break the 30 mpg barrier with my new exhaust system. Again, no way to verify but it certainly doesn't sound like a stock L98 out back of the car. There is not enough of the dreaded "Drone" that some aftermarket systems have.
I bought both of my systems from Allens Stainless Exhaust from Indiana I believe. I was able to buy them at Corvettes @ Carlisle and saved more than a few bucks and had no shipping to contend with.
Both of my systems are now 20+ years old and are still sounding great. I was very happy with the quality and fitment of the parts from Allens Stainless. I still love just listening to the car when on a highway with jersey barriers or any embankment to reflect some of the music back to me.
I am very happy with the systems and have had no trouble getting through the emissions inspection station or on safety inspections. Some inspectors notice the total lack of mufflers but have not made it an issue.
Good Luck and I hope my .02 cents helps!
I have two Corvettes and both of them have Chambered exhaust systems on them. On my 1968 BB it sounds like side pipes but the noise is behind you instead of next to your door. It sounds very nice but I can't say whether it helped or hurt my power output.
On my C4, a 1988 Coupe with the stock L98 It helped my mileage on the highway a bit. I was able to break the 30 mpg barrier with my new exhaust system. Again, no way to verify but it certainly doesn't sound like a stock L98 out back of the car. There is not enough of the dreaded "Drone" that some aftermarket systems have.
I bought both of my systems from Allens Stainless Exhaust from Indiana I believe. I was able to buy them at Corvettes @ Carlisle and saved more than a few bucks and had no shipping to contend with.
Both of my systems are now 20+ years old and are still sounding great. I was very happy with the quality and fitment of the parts from Allens Stainless. I still love just listening to the car when on a highway with jersey barriers or any embankment to reflect some of the music back to me.
I am very happy with the systems and have had no trouble getting through the emissions inspection station or on safety inspections. Some inspectors notice the total lack of mufflers but have not made it an issue.
Good Luck and I hope my .02 cents helps!
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marshal135 (09-26-2017)
#5
Burning Brakes
#6
Former Vendor
Member Since: Aug 2006
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St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
I have it on my 72 and I have some videos of both the chambered and the stage II exhaust on Youtube.
Here are the two systems we offer... The stage II is probably our most popular system too.. It sounds great with a beater camshaft and it sounds great with a stock one. Either system can be ordered for a car with or without headers as well. Keep in mind the 1972 in the second video has a huge camshaft... so it's a bit deceiving... The engine will play a huge roll in how the systems sound.
Personally.. I like the stage II system which is the 69 side pipes split into two sections, one as a resonator and the rear as a muffler. That's what is on the video in the lower section.
But the chambered system below is mellow and sounds way better than the the stock exhaust...
Willcox
Small block 72 with chambered.
http://willcoxcorvette.com/product_i...ducts_id=27260
Hefty small block with Stage II
http://willcoxcorvette.com/product_i...ducts_id=27267
Chambered: https://willcoxcorvette.com/corvette...uminized-25565
Stage II https://willcoxcorvette.com/corvette...-79-aluminized
Here are the two systems we offer... The stage II is probably our most popular system too.. It sounds great with a beater camshaft and it sounds great with a stock one. Either system can be ordered for a car with or without headers as well. Keep in mind the 1972 in the second video has a huge camshaft... so it's a bit deceiving... The engine will play a huge roll in how the systems sound.
Personally.. I like the stage II system which is the 69 side pipes split into two sections, one as a resonator and the rear as a muffler. That's what is on the video in the lower section.
But the chambered system below is mellow and sounds way better than the the stock exhaust...
Willcox
Small block 72 with chambered.
http://willcoxcorvette.com/product_i...ducts_id=27260
Hefty small block with Stage II
http://willcoxcorvette.com/product_i...ducts_id=27267
Chambered: https://willcoxcorvette.com/corvette...uminized-25565
Stage II https://willcoxcorvette.com/corvette...-79-aluminized
Last edited by Willcox Corvette; 09-25-2017 at 08:20 PM.
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Stingre' (09-30-2017)
#7
Dr. Detroit
Member Since: Mar 2012
Location: New Braunfels Texas
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I had a bone stock 427/400 three years ago and put a Wilcox chambered system on it......the stock system was 2"......yes 2".........the 2 1/2" that I installed flowed so much better that I had to drop the idle like 300 rpm......
Plus it sounded great.....and fit perfect.
Stock exhaust is a joke at best on these......absolute garbage.....if I had a 100 point car....it would get this system.....they just do not run right as GM intended......corked up to much.
Jebby
Plus it sounded great.....and fit perfect.
Stock exhaust is a joke at best on these......absolute garbage.....if I had a 100 point car....it would get this system.....they just do not run right as GM intended......corked up to much.
Jebby
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marshal135 (09-26-2017)
#9
Racer
I had Summit # 630125 mufflers on my modded "75 L48, 4 speed with full length 2 1/2 inch system. These muffs had a nice tone but severe cabin drone at 35 to 55 mph. I went to Flow Tech Terminator dual chamber muffs and the drone all but disappeared but I couldn't say the car had any more go power. In the spring of this year I added Tri 5 short tube headers and the drone is gone completely. Without track numbers to go by I couldn't confirm any performance gains but seat of the pants feel is much better and the tone is great. I can rattle the neighbors windows and bark the tires in 2nd and 3rd with a smile on my face.
Good luck with your project; Jerry
Good luck with your project; Jerry
#10
Melting Slicks
I had a bone stock 427/400 three years ago and put a Wilcox chambered system on it......the stock system was 2"......yes 2".........the 2 1/2" that I installed flowed so much better that I had to drop the idle like 300 rpm......
Plus it sounded great.....and fit perfect.
Stock exhaust is a joke at best on these......absolute garbage.....if I had a 100 point car....it would get this system.....they just do not run right as GM intended......corked up to much.
Jebby
Plus it sounded great.....and fit perfect.
Stock exhaust is a joke at best on these......absolute garbage.....if I had a 100 point car....it would get this system.....they just do not run right as GM intended......corked up to much.
Jebby
Mike
Last edited by v2racing; 09-26-2017 at 01:15 PM.
#11
Safety Car
It is not "Noise"....
It is not NOISE, It is music to the ears of we the mechanical few!
This type of sound belongs with a Corvette! It would sound "out of place" on a Chevette.
If you are using a carburetor be sure to check your plug readings after switching to a free (r) flowing exhaust like the Chambered Systems. Mine required a change to one size larger main jets.
Best wishes for a great sounding engine!
This type of sound belongs with a Corvette! It would sound "out of place" on a Chevette.
If you are using a carburetor be sure to check your plug readings after switching to a free (r) flowing exhaust like the Chambered Systems. Mine required a change to one size larger main jets.
Best wishes for a great sounding engine!
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marshal135 (09-29-2017)
#12
Heel & Toe
Sounds nice. I have a 69 427/390....it came from factory with rear exhaust and the previous owner installed Hooker side pipes. I will be removing my Hooker side pipes and installing exhaust out the rear again.
Would you say the Stage II or chambered is louder?
I like the sound of both in your video....
Would you say the Stage II or chambered is louder?
I like the sound of both in your video....
I have it on my 72 and I have some videos of both the chambered and the stage II exhaust on Youtube.
Here are the two systems we offer... The stage II is probably our most popular system too.. It sounds great with a beater camshaft and it sounds great with a stock one. Either system can be ordered for a car with or without headers as well. Keep in mind the 1972 in the second video has a huge camshaft... so it's a bit deceiving... The engine will play a huge roll in how the systems sound.
Personally.. I like the stage II system which is the 69 side pipes split into two sections, one as a resonator and the rear as a muffler. That's what is on the video in the lower section.
But the chambered system below is mellow and sounds way better than the the stock exhaust...
Willcox
Small block 72 with chambered.
http://willcoxcorvette.com/product_i...ducts_id=27260
Would you please rank the Stage II nosie level vs standard chambered?
Hefty small block with Stage II
http://willcoxcorvette.com/product_i...ducts_id=27267
Chambered: https://willcoxcorvette.com/corvette...uminized-25565
Stage II https://willcoxcorvette.com/corvette...-79-aluminized
Here are the two systems we offer... The stage II is probably our most popular system too.. It sounds great with a beater camshaft and it sounds great with a stock one. Either system can be ordered for a car with or without headers as well. Keep in mind the 1972 in the second video has a huge camshaft... so it's a bit deceiving... The engine will play a huge roll in how the systems sound.
Personally.. I like the stage II system which is the 69 side pipes split into two sections, one as a resonator and the rear as a muffler. That's what is on the video in the lower section.
But the chambered system below is mellow and sounds way better than the the stock exhaust...
Willcox
Small block 72 with chambered.
http://willcoxcorvette.com/product_i...ducts_id=27260
Would you please rank the Stage II nosie level vs standard chambered?
Hefty small block with Stage II
http://willcoxcorvette.com/product_i...ducts_id=27267
Chambered: https://willcoxcorvette.com/corvette...uminized-25565
Stage II https://willcoxcorvette.com/corvette...-79-aluminized
#14
Race Director
If you have ever owned or built performance motorcycles you know that the slightest upgrade in any component makes a huge difference in performance. One of the biggest performance gains is achieved aby installing a good chambered exhaust system.
Noise doesn't mean performance but the proper system matched with any other upgrades makes all the difference.
I'll be installing a chambered exhaust system as part of my resto mod and the ones sold through Wilcox have been rated very well.
Noise doesn't mean performance but the proper system matched with any other upgrades makes all the difference.
I'll be installing a chambered exhaust system as part of my resto mod and the ones sold through Wilcox have been rated very well.