Flowmaster or Magnaflow?
Posted 16 February 2010 - 09:10 AM
Posted 16 February 2010 - 10:08 PM
Posted 18 February 2010 - 09:05 AM
I recently sold a 95 Firebird, with the 3.4 litre V6. I did not go to the expense of a name brand muffler just for the sound. You can get the same result in sound with an ordinary " TURBO " muffler, without the expense. Now on my 6.6 I had headers installed and all new exhaust. I tried the Borla, and settled on the flowmasters. After about 1000 miles over a years driving, they sound really good.
would u happen to know if flowmaster restrict ur cars horepower or not i mean for the sound id go wid flowmasters but ive been told they can be very restrictive
Posted 18 February 2010 - 09:48 AM
That being said, in my experience with V8's, I prefer the sound from the Magnaflows over Flowmasters. But if I was going to replace an entire system, I'd probably go with something higher-end than either of those two. That's my plan for LadyHawk, which is currently equipped with a Flowmaster (I'm the 5th owner and it came to me that way).
Rest In Peace, Pete, a.k.a. "Brother Rat" and Jay, our Firebird Brother!
Y'all two keep each other out of trouble up there, okay?
Posted 21 February 2010 - 02:45 PM
Posted 08 May 2011 - 04:58 PM
I forgot to mention, the 40 series is better known as the American Thunder series.
Posted 09 May 2011 - 02:15 AM
Posted 20 May 2011 - 08:21 AM
Just remember if you can not see thrue the muffler then it is a restrictive muffler. Yeah flowmaster sound pretty cool but that is about it. Im not sure how much back pressure V6's like but I know V8s don't much care for it. Dynomax,Magnaflow,Borla are all very good performance mufflers. Even the cheapo turbo mufflers will flow better the a Flowmaster or any weld chamber style muffler. But I'm sure on a street car you will never see the difference.
The flowmaster may not be the best flowing and a bit restrictive, but I installed mine about a month ago and have enjoyed the difference from the stock muffler. I was getting about 21.5 mpg before and am now getting 23-23.5mpg. I didn't use the the full exhaust kit though and I pieced it together myself which may have helped. Here's a link to the video and picture I posted earlier (near the bottom)
Posted 20 May 2011 - 08:47 AM
My only experience is with the Mufflex 4" catback, using the Flowmaster 30-series Race 4" single in/single out muffler. I pushed 800HP through it, and it did not reduce HP at all - dyno verified. Buddy of mine with the same setup pushed over 1,000 HP through the same muffler/catback, pulled the sytem off, and went to collector mufflers and dumps, and no change in HP at all - dyno proven. Biggest advantage of removing the system was getting rid of about 50# of excess weight. You can not see through the 30-series mufflers, they have a "delta" shaped baffle system.
As far as "liking" backpressure, that's a huge myth. Anything that causes backpressure causes reduced flow. The more you reduce flow, the less HP you make. Reduced power following removal of a muffler, or install of a larger exhaust system is usually due to failure to retune for the improved volumetric efficiency. You need to address gas velocity in the primaries of a tubular header system, but once you get past the collectors, you do not want backpressure.
- V6birdman likes this
1994 FIREBIRD FORMULA
381ci all-forged stroker (Callies Stealth, Oliver billet rods, BME 2618-T61 nitrous pistons) - 10.8:1 - CNC LT4 heads/intake - Comp Cams solid roller - MoTeC M48 Pro engine management - 8 LS1 coils - 58mm TB - 74#/HR injectors - 300-shot dry nitrous - TH400 - Gear Vendors 0.78:1 O/D - Strange 12-bolt - 4.11 Pro-Street gears - AS&M headers - true duals - Corbeau seat - AutoMeter gauges - roll bar - Spohn suspension - QA1 shocks - a few other odds 'n ends. 800HP / 800lb-ft at the flywheel, on a 300-shot. 11.5 @ 117 MPH straight motor
Posted 29 July 2011 - 06:33 AM
Posted 29 July 2011 - 06:45 AM
the magnaflow had less interior drone, but with a more aggressive tone..... and I stuck with the magnaflow
good luck with it
Posted 16 October 2018 - 06:22 AM
Posted 16 October 2018 - 07:59 PM
Posted 19 October 2018 - 03:14 AM
The think the old myth of engines "liking backpressure" comes from carburetor days. Back in the day, if you improved the exhaust flow with headers or even just a better flowing muffler, it usually required going up at least a few jet sizes. If you just did the exhaust changes without the jet change the air/fuel went a bit lean. The observation that you just did something the engine did not seem to like may have been correct, but the reason why was because now the air/fuel ratio was leaner, not that you took away some "needed" backpressure. Even in today's engines, if you change cams, intake, exhaust, compression, etc.....you will get the most of the modification if go into the tune and optimize the MAF curve, or VE table, ignition timing tables, cam phasers, etc. The same muffler will not sound the same when put on different cars because engine size, exhaust valve opening timing, compression, air fuel ratio and even ignition timing all effect how the exhaust will sound. If I say I put traditional Flowmaster 40's on my car and I think they sound great, that does not mean they will sound the same on your car. Furthermore, what your personal opinion in what you think a sweet sounding exhaust should sound like may be different than mine.
Edited by JoePeek, 19 October 2018 - 03:15 AM.
Posted 21 October 2018 - 05:57 AM
So unless your engine is very worked and you run headers any muffler is fine
Not trying to sound like a jerk but its the truth, i have decades of experience lol owned cars from all 4 generations with v6 and v8 , with the v6 and 305 the exhast will never sound like a muscle car ive tried all different pipes and muffler combos
Posted 21 October 2018 - 01:11 PM
This entire thread is of very limited value, and maybe its time to close it.
- TOMR67 likes this
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