Generation III External Engine LS1 | LS6 | Bolt-Ons | Intakes | Exhaust | Ignition | Accessories
Sponsored by:
Sponsored by:

Flowmasters

Old Mar 27, 2007 | 07:52 PM
  #1  
BlackSVT03's Avatar
Thread Starter
Launching!
iTrader: (1)
 
Joined: Jul 2006
Posts: 213
Likes: 0
Default Flowmasters

I know these are highly frowned upon, but my friend has a flowmaster on his longtubes and O/R Y pipe and I really like the sound. It has a chambered sound to it.

I have an 80 series with longtubes and an O/R Y and it just sounds deep. Is there another flowmaster that fits the cross flow patern on LS1s Camaros and Trans Ams? Just curious. Like I dont think the 40 series comes in a cross flow. Does it?

Thanks guys,
Reply
Old Mar 27, 2007 | 07:55 PM
  #2  
bww3588's Avatar
12 Second Club
20 Year Member
iTrader: (49)
 
Joined: Sep 2005
Posts: 8,139
Likes: 10
From: Chillicothe/Lima, Ohio
Default

no there isisnt, the 80 series is the only crossflow design. and it flows worse than the stock cat-back. your only other option is a traditional flowmaster in the i-pipe or custom duals with 2.
Reply
Old Mar 27, 2007 | 10:35 PM
  #3  
5_02ls1's Avatar
11 Second Club
iTrader: (20)
 
Joined: Oct 2006
Posts: 3,131
Likes: 0
From: Virginia
Default wrong

Originally Posted by bww3588
no there isisnt, the 80 series is the only crossflow design. and it flows worse than the stock cat-back. your only other option is a traditional flowmaster in the i-pipe or custom duals with 2.
the catbacks only come with the 80 you need to purchase the 40 seperatly.i have the 40m series on my car.it sounds great.summit or jefs either one has it
Reply
Old Mar 28, 2007 | 05:53 AM
  #4  
LS69TA's Avatar
TECH Veteran
iTrader: (30)
 
Joined: Jan 2003
Posts: 4,391
Likes: 0
From: Texarkana, Tx
Default

Not all Flowmasters are bad. It's just that the 80 series they make for our cars sucks.
Reply
Old Mar 28, 2007 | 08:41 PM
  #5  
HottLS1Z's Avatar
11 Second Club
iTrader: (5)
 
Joined: Aug 2004
Posts: 637
Likes: 0
From: Morris IL
Default

My 98 has true duals dumoed on it using 40 series on full bolt ons sounds great
Reply
Old Mar 28, 2007 | 09:41 PM
  #6  
ChocoTaco369's Avatar
Tech Resident
 
Joined: Jan 2006
Posts: 5,117
Likes: 3
From: Philly
Default

Originally Posted by bww3588
no there isisnt, the 80 series is the only crossflow design. and it flows worse than the stock cat-back. your only other option is a traditional flowmaster in the i-pipe or custom duals with 2.
yes, it flows bad. i don't know if it flows worse than STOCK. flowmaster still claims an increase in power over stock. i doubt they're lying as that would be false advertisement. you probably gain 2-3 horsepower over stock. most catbacks net you 10 on a stock car, and with heads and cam, a flowmaster can be a 20-25 rwhp bottleneck. however, at that level, the stock is probably more like 30 rwhp.

of course, this is all speculation so don't take this as gospel. however, "flows worse than stock"...i don't personally believe that.
Reply
Old Mar 28, 2007 | 10:40 PM
  #7  
RevGTO's Avatar
Pontiacerator
20 Year Member
Photogenic
Liked
Loved
iTrader: (12)
 
Joined: Nov 2003
Posts: 6,216
Likes: 236
From: Wichita KS / Rancho San Diego
Default

I believed what everybody said about Flowmasters being so restrictive until I watched my buddy with a Flowmaster 80 do back to back runs cut out open and closed. No difference (actually .03 better closed!). This was lid/LT's/ORY ... maybe at big power levels it would be restrictive, but not stock or mild bolt-on.
Reply
Old Mar 28, 2007 | 10:58 PM
  #8  
GT Griller's Avatar
12 Second Club
20 Year Member
iTrader: (8)
 
Joined: Oct 2004
Posts: 1,689
Likes: 0
From: Hereford,Lubbock
Default

true-duals with single chambers are the way to go....get to keep that flowmaster sound with great gains!!!! but im biased...lol
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old Mar 29, 2007 | 12:35 AM
  #9  
kbronSS's Avatar
TECH Enthusiast
 
Joined: Jul 2003
Posts: 734
Likes: 7
From: Imperial Valley, CA
Default

im planning on installing a little Ypipe right over the axle, which would make two pipes.....then install a single chamber on each pipe.
Reply
Old Mar 29, 2007 | 12:40 AM
  #10  
ChocoTaco369's Avatar
Tech Resident
 
Joined: Jan 2006
Posts: 5,117
Likes: 3
From: Philly
Default

Originally Posted by RevGTO
I believed what everybody said about Flowmasters being so restrictive until I watched my buddy with a Flowmaster 80 do back to back runs cut out open and closed. No difference (actually .03 better closed!). This was lid/LT's/ORY ... maybe at big power levels it would be restrictive, but not stock or mild bolt-on.
i'm not calling you a liar or anything, but i've heard of people gaining 20 rwhp by opening their cutout with a flowmaster. this seems to be a common figure for a full exhaust + cam only car. it sounds to me like your friend may need a tune? i've heard of people going with longtube headers+ory and only gaining some 5 or 6 rwhp. it's a very rare event, but your friend may be one of them and that's why flowmaster's restriction isn't showing up. no matter what muffler you run, you should gain a bit with the cutout open. i hear even loudmouths gain with an open cutout.
Reply
Old Mar 29, 2007 | 08:20 AM
  #11  
RevGTO's Avatar
Pontiacerator
20 Year Member
Photogenic
Liked
Loved
iTrader: (12)
 
Joined: Nov 2003
Posts: 6,216
Likes: 236
From: Wichita KS / Rancho San Diego
Default

I'm not drawing any huge conclusions ... I was there, watched the runs, examined the timeslips and we were both surprised. It's just that when everyone says what HUGE restriction a Flowmaster 80 is, here's some evidence to the contrary. Take it FWIW and compare to your own experience.
Reply
Old Mar 29, 2007 | 08:34 AM
  #12  
taintedmeat's Avatar
TECH Fanatic
iTrader: (1)
 
Joined: Apr 2005
Posts: 1,625
Likes: 0
From: ATX
Default

Originally Posted by HottLS1Z
My 98 has true duals dumoed on it using 40 series on full bolt ons sounds great
Pics and clips?
Reply
Old Mar 29, 2007 | 02:38 PM
  #13  
redz_02's Avatar
TECH Fanatic
iTrader: (4)
 
Joined: Dec 2002
Posts: 1,046
Likes: 1
From: Austin, TX
Default

I run an 80 on mine, love the sound, as for the flow issue, thats what they make cutouts for.
Reply
Old Mar 29, 2007 | 03:28 PM
  #14  
02BEAST's Avatar
11 Second Club
iTrader: (8)
 
Joined: Aug 2006
Posts: 528
Likes: 3
From: Mass
Default

Just put a cut-out in there and your good I did it sounds great.
Reply
Old Mar 29, 2007 | 05:20 PM
  #15  
5_02ls1's Avatar
11 Second Club
iTrader: (20)
 
Joined: Oct 2006
Posts: 3,131
Likes: 0
From: Virginia
Default me too

Originally Posted by taintedmeat
Pics and clips?
id love to hear that setup as well
Reply
Old Mar 29, 2007 | 05:23 PM
  #16  
NHRAMAN's Avatar
TECH Senior Member
iTrader: (1)
 
Joined: Apr 2005
Posts: 8,807
Likes: 0
From: Vancouver,[KITSILANO].B.C. Canada *WestCoast*
Exclamation

Originally Posted by bww3588
no there isisnt, the 80 series is the only crossflow design. and it flows worse than the stock cat-back. your only other option is a traditional flowmaster in the i-pipe or custom duals with 2.
NO IT DOESN'T. I have seen many charts on here....so have many others....I have lt's+ory+cutout+80 series.... Sounds good...C/O open 1/3 of the way.
Reply
Old Mar 29, 2007 | 07:42 PM
  #17  
INMY01TA's Avatar
11 Second Club
20 Year Member
iTrader: (1)
 
Joined: Apr 2003
Posts: 3,235
Likes: 2
From: Crofton Md.
Default

Personally I think Flowmaster sounds much better on an LT1 or Stangs than LS1 cars. I had the 80 on my TA with and with out headers/ory and thought it sounded pretty weak.
Reply
Old Mar 29, 2007 | 07:48 PM
  #18  
bww3588's Avatar
12 Second Club
20 Year Member
iTrader: (49)
 
Joined: Sep 2005
Posts: 8,139
Likes: 10
From: Chillicothe/Lima, Ohio
Default

Originally Posted by NHRAMAN
NO IT DOESN'T. I have seen many charts on here....so have many others....I have lt's+ory+cutout+80 series.... Sounds good...C/O open 1/3 of the way.
ok, for the NIT PICKERS on here!, it is regarded as the worst flowing aftermarket cat-back on the market.
Reply
Old Mar 29, 2007 | 07:48 PM
  #19  
bww3588's Avatar
12 Second Club
20 Year Member
iTrader: (49)
 
Joined: Sep 2005
Posts: 8,139
Likes: 10
From: Chillicothe/Lima, Ohio
Default

Originally Posted by INMY01TA
Personally I think Flowmaster sounds much better on an LT1 or Stangs than LS1 cars. I had the 80 on my TA with and with out headers/ory and thought it sounded pretty weak.
an LS1 IMO doesnt have a good exhaust note with any exhaust, unless its cammed.
Reply


Thread Tools
Search this Thread

All times are GMT -5. The time now is 09:55 AM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE