Think ALL Flowmaster mufflers lose power? Think again...
#1
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
I rented some dyno time for a few tests today, one was to see how much power my single chamber flowmasters were robbing me. So I did a baseline with them on, then yanked em off for the next pull. The results were shocking to say the least! With no mufflers on my true duals and x-pipe setup, it picked up only 2rwhp, and the torque remained the same! So much for worrying about losing power to sound good
![Grin](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_grin.gif)
#2
MASS seller approved
iTrader: (160)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
I rented some dyno time for a few tests today, one was to see how much power my single chamber flowmasters were robbing me. So I did a baseline with them on, then yanked em off for the next pull. The results were shocking to say the least! With no mufflers on my true duals and x-pipe setup, it picked up only 2rwhp, and the torque remained the same! So much for worrying about losing power to sound good![Grin](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_grin.gif)
![Grin](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_grin.gif)
![Thumb](https://ls1tech.com/forums/images/smilies2/thumb.gif)
#4
TECH Regular
iTrader: (20)
Join Date: Feb 2007
Location: Los Angeles, CA
Posts: 436
Likes: 0
Received 0 Likes
on
0 Posts
![](https://ls1tech.com/forums/images/ranks/ls1tech10year.png)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
I rented some dyno time for a few tests today, one was to see how much power my single chamber flowmasters were robbing me. So I did a baseline with them on, then yanked em off for the next pull. The results were shocking to say the least! With no mufflers on my true duals and x-pipe setup, it picked up only 2rwhp, and the torque remained the same! So much for worrying about losing power to sound good![Grin](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_grin.gif)
![Grin](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_grin.gif)
#5
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
That's pretty much the results I was expecting from a test like this. The different series might lose different amounts, but I don't think it's gonna be as much as the Flowmaster bashers make it out to be.
Trending Topics
#9
9 Second Club
iTrader: (2)
Join Date: Jul 2002
Location: on the dyno tuning in MD
Posts: 2,583
Likes: 0
Received 1 Like
on
1 Post
![](https://ls1tech.com/forums/images/ranks/ls1tech10year.png)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Those aren't the Flowmasters that suck - I've run the single chambers on my car and had the same results as you...
The stock type crossflow Flowmaster is the one that sucks - have seen cars consistently pick up 20 to 25 rwhp with a cutout open on a crossflow Flowmaster... not just one, at least 8 or 10 cars...
The stock type crossflow Flowmaster is the one that sucks - have seen cars consistently pick up 20 to 25 rwhp with a cutout open on a crossflow Flowmaster... not just one, at least 8 or 10 cars...
#10
LS1 Tech Administrator
iTrader: (14)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
The Flowmaster design is proven and it's known to make around the same power as an open pipe when you use the proper configuration. Dual Flows on an F-body make for a great sounding, great performing exhaust. But this does not apply to the Crossflow design that mimicks the stock F-body muffler. Those sound wonderful but their performance is a step down from most other performance catbacks. They give Flowmaster a bad name.
__________________
![](https://ls1tech.com/forums/signaturepics/sigpic210_1.gif)
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
![](https://ls1tech.com/forums/signaturepics/sigpic210_1.gif)
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
#12
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
The single chambers are 10 series.
Catbacks can use the stock, ory, or catted Ys. This is a true dual setup however.
I have seen this as well. However, on this day, my car was making nearly identical numbers on un-changed pulls. I don't have the graph yet to see the times between. This pull with the mufflers off was the 4th pull.
Also guys, I understand that all the Flowmaster mufflers aren't poor performers. And yes, I DO know that the 80 series is the bad apple. I just did this test to see the results for myself, and to share with whoever might be interested, cause I have read, and have heard people say, that even these 10 series flows weren't gonna be as great in comparison to other choices by a significant margin.
Catbacks can use the stock, ory, or catted Ys. This is a true dual setup however.
Also guys, I understand that all the Flowmaster mufflers aren't poor performers. And yes, I DO know that the 80 series is the bad apple. I just did this test to see the results for myself, and to share with whoever might be interested, cause I have read, and have heard people say, that even these 10 series flows weren't gonna be as great in comparison to other choices by a significant margin.
#19
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
I'm one of the guys that removed a 2-chamber Flowmaster (non-crossflow design) and picked up 45 rwhp on a 305 rwhp combo.
I like my Magnaflow because it's quiet and 700 rwhp car doesn't gain anything when I remove it. To me, THAT's impressive. It flow's AND muffles. I had good luck with SLP and the Aerochamber crossflow also. SpinTech sucks, though. +3 mph in the quarter when removing a single 3.5".
Mike