Flow master super 44 resonance problem.
Thread Starter
Instructor
Joined: Jun 2018
Posts: 107
Likes: 28
Flow master super 44 resonance problem.
Hi, I have a pair of flowmaster super 44’s on my 74, fed straight from ceramic coated short headers. The drone in the car at 1300-1800rpm is unbearable, it’s fine after, on load or not and at idle. Would sound proofing cure this? Or am I better off replacing the 44’s? It’s one piece welded so they’d need cutting off. Or could I add a centre resonator?
Thanks, Tim.
Thanks, Tim.
Just another Corvette guy
Joined: Feb 1999
Posts: 8,518
Likes: 3,865
From: Palm Springs, CA.
That won't stop the drone. I've had it too. It is unbearable on the freeway. Try switching to 40's. I just installed a pair on my '73 and they give good tone without the dreaded drone.
Last edited by Greg; Aug 1, 2018 at 01:14 PM.
Pro
Joined: May 2016
Posts: 708
Likes: 150
From: Minnesota
I have 40's on my '70 with a hopped up 355, 2-1/2" all the way back and a smaller 1-1/2" H-Pipe behind the trans. One spot of resonance from 1600-1800 rpm otherwise beautiful, you can converse on the highway, awesome sound and it does not drone.
Before you cut those mufflers off, try having an H-pipe installed. You might be surprised.
Before you cut those mufflers off, try having an H-pipe installed. You might be surprised.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Get the biggest case turbo muffler you can under there, youll be much happier. Resonator wont get rid of the drone most aftermarkets are known for.
Doubt youll see any power loss at all.
Doubt youll see any power loss at all.
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
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Burning Brakes
Joined: May 2018
Posts: 797
Likes: 156
From: England AR
get Pype Violators or Flowmaster 40 original NON- delta
either are my personal fave, Flowmasters have the famous purr and the Pype Violators have a deep raspy snarl
Pypes are a turbo style, far better flow than Flowmaster, but it's all about sound to me.
Pypes on my 408w, sounded great at idle, not too loud, but when you got on it on the freeway, it was insanely loud, but just cruising was barely even there, it was such a sleeper.... ruined a lot of c5 and c6's day with that car
either are my personal fave, Flowmasters have the famous purr and the Pype Violators have a deep raspy snarl
Pypes are a turbo style, far better flow than Flowmaster, but it's all about sound to me.
Pypes on my 408w, sounded great at idle, not too loud, but when you got on it on the freeway, it was insanely loud, but just cruising was barely even there, it was such a sleeper.... ruined a lot of c5 and c6's day with that car
Last edited by naramlee; Aug 1, 2018 at 06:49 PM.
Thread Starter
Instructor
Joined: Jun 2018
Posts: 107
Likes: 28
Lots of ideas!
Does an H section make a difference? Mine are separate at the moment.
My main problem is I’m in the uk, so availability of some systems is awkward.
I can get the walker dynomax super turbo’s as mentioned above, would they be a good choice?
Does an H section make a difference? Mine are separate at the moment.
My main problem is I’m in the uk, so availability of some systems is awkward.
I can get the walker dynomax super turbo’s as mentioned above, would they be a good choice?
Melting Slicks
Joined: Jul 2006
Posts: 2,291
Likes: 492
From: Salmon Arm, BC
Going to the 40's won't help....they drone too.
As Crimson Thunder pointed out, the 50's do not drone, but they still have the nice sound of Flowmasters, I have them on my car too.
An H-pipe will tone down the sound some.
As Crimson Thunder pointed out, the 50's do not drone, but they still have the nice sound of Flowmasters, I have them on my car too.
An H-pipe will tone down the sound some.
Race Director
Joined: Mar 2016
Posts: 14,395
Likes: 8,203
From: Napa Valley California
Tests show that an H or X pipe in the system will increase performance and most people state it lessens or deletes the drone.
There have been several threads on this and U-Tube videos.
There have been several threads on this and U-Tube videos.
Race Director
Joined: Apr 2003
Posts: 19,351
Likes: 654
From: Tampa, Florida
I had a removebable 'X' pipe on my '06 GTO, it'd take me all of 5 minutes to swap back and forth between it and straight pipes. The 'X' or 'H' will mellow it out but wont eliminate the drone.