Original Mufflers?
Thread Starter
Racer
Joined: Nov 2000
Posts: 262
Likes: 0
From: Milwaukee, WI USA
Original Mufflers?
Hi all! I'm considering replacing the mufflers on my 85 with OEM Walker mufflers. The ones on it now are original but the previous owner cut holes in the muffler to make the "dummy" pipes into "real" pipes.
My goal is to get back to the stock sound, which should be more pleasing--more of a growl, not as boomy and less resonance.
I'm also thinking about replacing the rear Y with a cross-tube Y pipe to reduce resonance.
Will these changes accomplish my goal? Any recommendations?
My goal is to get back to the stock sound, which should be more pleasing--more of a growl, not as boomy and less resonance.
I'm also thinking about replacing the rear Y with a cross-tube Y pipe to reduce resonance.
Will these changes accomplish my goal? Any recommendations?
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Re: Original Mufflers? (85Coupe4+3)
I highly recommend the crossover rear y pipe. Also, make sure the rubber isolators on your rear exhaust mounts aren't deteriorated. That, and tips that protrude at least to the edge of the rear bumper indents will all reduce resonance.
I'm running a high flow cat and straight pipes on my '85, and have very little resonance. It isn't exactly quiet though. :reddevil
I'm running a high flow cat and straight pipes on my '85, and have very little resonance. It isn't exactly quiet though. :reddevil
Thread Starter
Racer
Joined: Nov 2000
Posts: 262
Likes: 0
From: Milwaukee, WI USA
Re: Original Mufflers? (CentralCoaster)
Thanks, CC. I've got exhaust tips. But I think I'll try the y-pipe next . . . really it's the resonance that's giving me headaches, not the noise per se. If you don't have resonance with straight pipes, that must be the solution.
By the way, great photo of your '85 with the sunset. Really cool.
[Modified by 85Coupe4+3, 10:38 PM 2/2/2004]
By the way, great photo of your '85 with the sunset. Really cool.
[Modified by 85Coupe4+3, 10:38 PM 2/2/2004]
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Re: Original Mufflers? (85Coupe4+3)
The way the mufflers work, you'll have noise cancellation (destructive interference) at certain RPMs, but extra resonance at other RPMs. You simply can't have your cake and eat it too.
The perforations internal to the muffler, and it's restrictiveness help quiet down the resonance though... something you lose with open pipes.
Open pipes are loud as hell btw, I wouldn't consider it a solution by any means! :lol: BTW, the resonance isn't noticeable with the top on, at cruise the exhaust note is no louder than it was with my monza/kbd mufflers (but still loud).
The perforations internal to the muffler, and it's restrictiveness help quiet down the resonance though... something you lose with open pipes.
Open pipes are loud as hell btw, I wouldn't consider it a solution by any means! :lol: BTW, the resonance isn't noticeable with the top on, at cruise the exhaust note is no louder than it was with my monza/kbd mufflers (but still loud).
Thread Starter
Racer
Joined: Nov 2000
Posts: 262
Likes: 0
From: Milwaukee, WI USA
Re: Original Mufflers? (CentralCoaster)
Sorry I wrote that poorly. I meant that my problem might not be the cut open mufflers--it's more likely the y-pipe. But good points about resonance in the mufflers. Wish I could try out several configurations of y-pipe/muffler to see what works. The results from people here on CF seem to vary.
Thanks for your comments--very helpful.
Thanks for your comments--very helpful.
Racer
Joined: Apr 2003
Posts: 365
Likes: 0
From: Cupertino in Northern California
Re: Original Mufflers? (85Coupe4+3)
I posted a like inquiry a few days ago. My main objective is to elminate
(or greatly reduce) the resonance at 40-60 mph. I am purchasing the
y with crossover and should have it installed by next week. I will let
you know the results.
I also desire to replace the stock mufflers with flowmasters but I am not
sure whether the sound will be too loud. Have not made up my mind on
this mod.
:seeya
(or greatly reduce) the resonance at 40-60 mph. I am purchasing the
y with crossover and should have it installed by next week. I will let
you know the results.
I also desire to replace the stock mufflers with flowmasters but I am not
sure whether the sound will be too loud. Have not made up my mind on
this mod.
:seeya
Melting Slicks
Joined: Sep 2003
Posts: 2,775
Likes: 0
From: 1,000,000,001 Posts
Re: Original Mufflers? (85Coupe4+3)
I have a set of Walker OEM mufflers, 3 months old, look brand new, If you are interested. Let me know or shoot me an e-mail.
I can send pics if you would like. I replaced them with eliminators :D
I can send pics if you would like. I replaced them with eliminators :D
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski