Flowmaster Muffler Differences

[magstar67]

I recently had a local shop put a 50 Series Flowmaster on my truck and it is a little louder than I like. They are going to replace it with a 70 Series at no charge, I am just wondering how much difference I can expect between the 50 and the 70? I have listened to the sound clips on Flowmaster's site but cant tell a lot from those. Flowmaster seems to have several different 50 series mufflers and am not sure which one they put on.

 

Thanks,

Jeff

[2005LT]

Hey Jeff. I am curious about this as well. I know that Frank (Grumpy Aero Guy) had a 50 series in his 07' 5.3L and the drone was too much. He got a 70 Series Big Block 2 and seemed to like it. It would be nice to have an update from him to see if all is still well. Jim (Zembonez) has a 70 series too if i'm not mistaken.

[john1233]

I recently had a local shop put a 50 Series Flowmaster on my truck and it is a little louder than I like. They are going to replace it with a 70 Series at no charge, I am just wondering how much difference I can expect between the 50 and the 70? I have listened to the sound clips on Flowmaster's site but cant tell a lot from those. Flowmaster seems to have several different 50 series mufflers and am not sure which one they put on.

 

Thanks,

Jeff

 

 

ive got the 70 series on my 2004 and i like it and think its about right. i actually called flowmaster up when i got ready to purchase and told them about what i wanted and thats what they recomended. hope this helps.

[alaska511]

I have had them both, you will be very pleased with the 70. Too much drone with the 50.

[stadt11]

I recently had a local shop put a 50 Series Flowmaster on my truck and it is a little louder than I like. They are going to replace it with a 70 Series at no charge, I am just wondering how much difference I can expect between the 50 and the 70? I have listened to the sound clips on Flowmaster's site but cant tell a lot from those. Flowmaster seems to have several different 50 series mufflers and am not sure which one they put on.

 

Thanks,

Jeff

 

Did you have the 50 Series Delta or SUV?

[magstar67]

Did you have the 50 Series Delta or SUV?

 

 

At this point I dont know which 50 they put on it but it is too loud for my tastes at least in 'around town' type driving, on the highway it isnt quite as bad but still too loud for me.

 

The 70 is supposed to be in later this week and I'll update then.

[pastorscott]

TRUST ME

 

I know most of the guys here are into loud 40 and 50 flomaster but after being on my 3rd 70 series I can tell you its the best of all worlds. I have a 04 burb 5.3 and its the best mufler and heres why.

 

#1 too much flow equals less low end power. ( sorry guys but your loud mufflers actually take away power off the line

#2 The 70 series is just the right amount of restriction without being too much

#3 The sound is oh so perfect and almost no drone at all ( I have a wife and she would let me know)

 

 

10 stars for sound and low end power for the 70 FLOW MASTER

 

point - best thing to do it keep the stock pipes and just change the muffler at a good custom shop

if you go with the flomaster kit they up the pipe size to 3in which offers too much flow = loss is low end power

 

just my two cents

Scott

[fbachman]

Hey Jeff. I am curious about this as well. I know that Frank (Grumpy Aero Guy) had a 50 series in his 07' 5.3L and the drone was too much. He got a 70 Series Big Block 2 and seemed to like it. It would be nice to have an update from him to see if all is still well. Jim (Zembonez) has a 70 series too if i'm not mistaken.

 

Yep.... the FM 70 Series Big Block II is still on, and I like it. As indicated above, THe 50 drone in the cab was too much for ME. Some may like it, but on the highway, it was a little too much.

 

Now, I just did a muffler swap, not a cat-back or anything like that. Nice mellow sound (you know it's there), but MUCH quiter in the cab.

 

I called FM after the 50 issue, and THEY recommended the 70 BB II, saying that they have seen tremendous resonance with the 50s on the GM trucks. Took their recommendation and am happy I did.

 

Now, the 70 is a three chamber muffler, and is quite a bit larger (and heavier) then the 50. I think it cost more too. But, I recommend it.

 

[blackout07]

I have a Flowmaster 50 series (not sure which honestly) with a turn down and my AFM disabled and I barely notice it. Drone is minimal IMO.

[cerbomark]

thinking of going with a 70 and just putting it inplace of stock muffler. I had either a 50-or70 on my 07 and liked it. Is the 70 going to be any different than my stock muffler sound wise?

[gmowner4life]

I have a 50 Series and although it is louder than stock, it's not too much, IMO. I would like to know what you think of your 70 after you install it. I may change.

[cerbomark]

there is a big difference in the 6.0 and 5.3 as far as droning. That s why the 6 s have a resonator and the 5.3 s don t.. So we should clairfy which engine you are speaking about IMO..

[cerbomark]

I have a 50 Series and although it is louder than stock, it's not too much, IMO. I would like to know what you think of your 70 after you install it. I may change.

Why? The 70 will be quieter.

[2005LT]

there is a big difference in the 6.0 and 5.3 as far as droning. That s why the 6 s have a resonator and the 5.3 s don t.. So we should clairfy which engine you are speaking about IMO..

 

I was not aware of that and always assumed they would act the same. Thanks for the insight.

 

I am seriously considering the 70 since I am looking for minimal drone. I also heard here on the forum that the 2009 6.0 have something different with the exhaust making it difficult for a cat-back replacement. Is this true? Will a simple muffler change-out be an issue on my truck?

[cerbomark]

A muffler change would not be a problem with your truck. Your 6.0 should have a resonator after the muffler on the tailpipe. I left that alone and just changed the muffler on my 07 (6.0) and it was fine. The 5.3 don t have the resonator on the tailpipe. So the two engines do produce different sound qualities thats why GM usues two differeent systems.