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Power effects exhaust system

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Old Sep 26, 2016 | 07:57 PM
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Default Power effects exhaust system

Hi guys and gals, I'm new to the forum, but definitely not new to the world's best AMERICAN MADE sports car as I am on my 10th vette. I must admit I slipped (since 1986) and owned several xjs v12 jaguars and a couple of xk8 ragtops. Nice cars but not corvettes . Recently I picked up an absolute mint 93 aqua/black ragtop with a 6 speed stick, 50,000 well cared for miles, equipped with a power effects exhaust. Like new in, out and underneath, I know the new ones are absolutely awesome as I have used my buddy's on several occasons but for some reason having had 5 c4's, I am drawn to them.
Any way, the power effects system gives you the big block sound with adjustable performance levels to decrease the rumble if you so desire. I must b getting old because i'd like to tone em down, and wondered if any one out there knows where the adjustment lever is located and if you've had success adjusting them. I'd love to hear from you and get your take on the system. back 20 odd years ago I restored a 69 big block roadster with factory side exhaust, any one familiar with that era knows they are awesome. Plenty of power and a sound that can't be beat. There no adjustment on those and when I was in my 40's the louder the better. ÷)
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Old Sep 26, 2016 | 09:41 PM
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Originally Posted by Espy1949
Hi guys and gals, I'm new to the forum, but definitely not new to the world's best AMERICAN MADE sports car as I am on my 10th vette. I must admit I slipped (since 1986) and owned several xjs v12 jaguars and a couple of xk8 ragtops. Nice cars but not corvettes . Recently I picked up an absolute mint 93 aqua/black ragtop with a 6 speed stick, 50,000 well cared for miles, equipped with a power effects exhaust. Like new in, out and underneath, I know the new ones are absolutely awesome as I have used my buddy's on several occasons but for some reason having had 5 c4's, I am drawn to them.
Any way, the power effects system gives you the big block sound with adjustable performance levels to decrease the rumble if you so desire. I must b getting old because i'd like to tone em down, and wondered if any one out there knows where the adjustment lever is located and if you've had success adjusting them. I'd love to hear from you and get your take on the system. back 20 odd years ago I restored a 69 big block roadster with factory side exhaust, any one familiar with that era knows they are awesome. Plenty of power and a sound that can't be beat. There no adjustment on those and when I was in my 40's the louder the better. ÷)













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Old Sep 26, 2016 | 09:48 PM
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Polo Is that portion wide open with the horizontal line ? Is it closed off when the line in the vertical position? Or? Please advise

Last edited by Goldcylon; Sep 26, 2016 at 09:49 PM.
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Old Sep 26, 2016 | 09:52 PM
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Default Power effects exhaust

Thanks goldcylon, That doesn't look at all like what I have. Is the adjuster under the side exhaust shroud? Is it possible that mine do not adjust?. I did call power effects today and left a voice mail.
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Old Sep 26, 2016 | 09:54 PM
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Originally Posted by Espy1949
Thanks goldcylon, That doesn't look at all like what I have. Is the adjuster under the side exhaust shroud? Is it possible that mine do not adjust?. I did call power effects today and left a voice mail.
I think you meant to ask Polo that. I was asking a valving question
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Old Sep 27, 2016 | 02:18 AM
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If you have the Side Effects system where the exhaust exits in front of the rear wheels then they do not adjust. The Power Effects system exits at the rear and they do adjust with the ****. As far as I remember, neither are being made anymore.
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Old Sep 27, 2016 | 11:49 AM
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Power Effects is what I have, it adjusts. Side Effects I believe does not have the adjuster.

They do not make them anymore.
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Old Feb 8, 2018 | 01:22 PM
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Default Purchase Power Effects exhaust

Originally Posted by Espy1949
Hi guys and gals, I'm new to the forum, but definitely not new to the world's best AMERICAN MADE sports car as I am on my 10th vette. I must admit I slipped (since 1986) and owned several xjs v12 jaguars and a couple of xk8 ragtops. Nice cars but not corvettes . Recently I picked up an absolute mint 93 aqua/black ragtop with a 6 speed stick, 50,000 well cared for miles, equipped with a power effects exhaust. Like new in, out and underneath, I know the new ones are absolutely awesome as I have used my buddy's on several occasons but for some reason having had 5 c4's, I am drawn to them.
Any way, the power effects system gives you the big block sound with adjustable performance levels to decrease the rumble if you so desire. I must b getting old because i'd like to tone em down, and wondered if any one out there knows where the adjustment lever is located and if you've had success adjusting them. I'd love to hear from you and get your take on the system. back 20 odd years ago I restored a 69 big block roadster with factory side exhaust, any one familiar with that era knows they are awesome. Plenty of power and a sound that can't be beat. There no adjustment on those and when I was in my 40's the louder the better. ÷)
I'm just trying to find a set I can buy!!!!!!!!!
Dennis
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Old Feb 8, 2018 | 01:26 PM
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Originally Posted by vader86
Power Effects is what I have, it adjusts. Side Effects I believe does not have the adjuster.

They do not make them anymore.
Okay..........then I can only hope that someone will sell me a used set...........I hope......I hope.....saying a little prayer....

Dennis
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Old Feb 8, 2018 | 01:40 PM
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Originally Posted by Dennis Coppock
Okay..........then I can only hope that someone will sell me a used set...........I hope......I hope.....saying a little prayer....

Dennis
Then I would suggest that you check in the C4 "parts for sale section" every day as well as starting to check with all the corvette salvage yards around the country.

In 13 years here I only recall seeing 2 sets of "power effects" and -o- sets of side effects ever coming up for sale on the used market.

Good luck and be sure to let all of us know if you ever stumble across a supply of them.
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Old Feb 8, 2018 | 03:11 PM
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Originally Posted by Mr. Peabody
Then I would suggest that you check in the C4 "parts for sale section" every day as well as starting to check with all the corvette salvage yards around the country.

In 13 years here I only recall seeing 2 sets of "power effects" and -o- sets of side effects ever coming up for sale on the used market.

Good luck and be sure to let all of us know if you ever stumble across a supply of them.
Will do......thanks

Dennis
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Old Mar 24, 2026 | 05:26 PM
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Just turn the **** on the power effect exhaust



Last edited by BET VETTE; Apr 2, 2026 at 11:48 AM.
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