New Magnaflow seems quiet
#1
Junior Member
Thread Starter
Join Date: Sep 2014
Location: Gig Harbor, WA
Posts: 56
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1991 Z28
Engine: L98
Transmission: 700r4
Axle/Gears: 3.73/Tru Trac
New Magnaflow seems quiet
All stock '91 Z28 with the L98. Replaced the stock muffler with a Magnaflow direct fit, 2.5" inlet, dual 2.5" outlet. I was hoping for more rumble than the stocker and it seems to be quieter. Will the sound improve as the internal packing "breaks in"?
FYI I just got the car and am new on her but have been lurking for a little while doing research.
FYI I just got the car and am new on her but have been lurking for a little while doing research.
#2
Supreme Member
Join Date: Apr 2010
Location: Modesto, California
Posts: 1,015
Likes: 0
Received 5 Likes
on
4 Posts
Car: 88 Firebird Formula
Engine: LO5 5.7 TBI/Ebl Flash
Transmission: 700R4
Axle/Gears: 2.73 stock rear end
Re: New Magnaflow seems quiet
All exhaust will break in and get slightly louder some get even louder as time goes on. Magnaflow is known for being quieter at idle but a screamer at WOT.
#3
Supreme Member
Join Date: Jul 1999
Location: Ahead of you...
Posts: 2,752
Likes: 0
Received 6 Likes
on
5 Posts
Car: 1984 LG4 Camaro
Engine: 350 Roller Motor
Transmission: Level 10 700R4
Axle/Gears: Strange 12 bolt 3.42
Re: New Magnaflow seems quiet
Magnaflow typically is a system that idles with a little more rumble than stock, but when it is wide open has a really good tone without being obnoxiously loud.
What sound are you looking for?
What sound are you looking for?
#4
Junior Member
Thread Starter
Join Date: Sep 2014
Location: Gig Harbor, WA
Posts: 56
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1991 Z28
Engine: L98
Transmission: 700r4
Axle/Gears: 3.73/Tru Trac
Re: New Magnaflow seems quiet
I listened to sound clips on YouTube but it is difficult to get a true sense of sound for the mufflers but they seem to be louder than mine. I guess it needs break in time.
I was hoping for a little more "authority" on the exhaust note. Thanks for the input!
I was hoping for a little more "authority" on the exhaust note. Thanks for the input!
#5
Supreme Member
iTrader: (8)
Join Date: Oct 2001
Location: Il
Posts: 11,694
Received 747 Likes
on
506 Posts
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: New Magnaflow seems quiet
The 2 1/2 inlet is smaller than the stock 2 3/4 intermediate pipe
3" intermediate pipe and 3" inlet muffler would help.
3" intermediate pipe and 3" inlet muffler would help.
#6
Junior Member
Thread Starter
Join Date: Sep 2014
Location: Gig Harbor, WA
Posts: 56
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1991 Z28
Engine: L98
Transmission: 700r4
Axle/Gears: 3.73/Tru Trac
Re: New Magnaflow seems quiet
I'm a truck and Jeep guy and totally new to this car thing. I've always run Flowmasters on my V8 Trucks but the consensus here is that they drone pretty bad on these cars. I'm sure I will be fine with it and if not, can always change it later. In the meantime I have a ton of suspension and brake parts to put on it before my wheels and tires arrive.
#7
Moderator
Re: New Magnaflow seems quiet
You might have been happier with a flowmaster 80 series.
Trending Topics
#8
Supreme Member
Re: New Magnaflow seems quiet
If all you swapped out is the muffler and left of the exhaust stock dont expect much.
#9
Supreme Member
Join Date: Apr 2006
Location: Northern, CA
Posts: 4,482
Likes: 0
Received 8 Likes
on
8 Posts
Car: 1989 Iroc-Z Camaro
Engine: TBI,5.0
Transmission: Automatic 700R4
Axle/Gears: Eaton Posi,3.42,LPW Ultimate Cover
Re: New Magnaflow seems quiet
In order to get a decent tone out of any muffler you need at least a 3in. cat back preferably with 3in tips , and they do break in.
My Flowmaster American Thunder cat back with 80 Series has gotten a lot deeper tone over the last 8 years. Love it.......
.
Last edited by Ron U.S.M.C.; 11-08-2014 at 11:28 PM.
#10
Member
iTrader: (1)
Join Date: Dec 2010
Location: Round Lake IL
Posts: 320
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1989 formula
Engine: 350 l98
Transmission: 700R-4
Axle/Gears: 327
Re: New Magnaflow seems quiet
I HAVE AN 89 formula l-98 and replaced my stock muffler with a flowmaster 80 and love it there a ton of sound clips on youtube, what magnaflow muffler did you put on it
#11
Supreme Member
Join Date: Apr 2006
Location: Northern, CA
Posts: 4,482
Likes: 0
Received 8 Likes
on
8 Posts
Car: 1989 Iroc-Z Camaro
Engine: TBI,5.0
Transmission: Automatic 700R4
Axle/Gears: Eaton Posi,3.42,LPW Ultimate Cover
Re: New Magnaflow seems quiet
[QUOTE=Ron U.S.M.C.
In order to get a decent tone out of any muffler you need at least a 3in. cat back.
.[/QUOTE]
I should not have said "decent tone". That's not the case.
The Flowmaster American Thunder 3" cat back with 3in. tips using the 80 series will give the car a deeper tone than that same car using stock pipe.
In order to get a decent tone out of any muffler you need at least a 3in. cat back.
.[/QUOTE]
I should not have said "decent tone". That's not the case.
The Flowmaster American Thunder 3" cat back with 3in. tips using the 80 series will give the car a deeper tone than that same car using stock pipe.
Last edited by Ron U.S.M.C.; 11-10-2014 at 12:55 AM.
#12
Supreme Member
iTrader: (2)
Join Date: Mar 2014
Location: South Ms
Posts: 4,422
Received 721 Likes
on
490 Posts
Car: 89 Firebird
Engine: 355 TBI
Transmission: 700R4
Axle/Gears: 10 Bolt.Posi-3.73s
Re: New Magnaflow seems quiet
My flowmaster exhaust sounded better after a few months I guess it got "broke in"
#14
Junior Member
Thread Starter
Join Date: Sep 2014
Location: Gig Harbor, WA
Posts: 56
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1991 Z28
Engine: L98
Transmission: 700r4
Axle/Gears: 3.73/Tru Trac
Re: New Magnaflow seems quiet
Good advice. I will have someone else give me a fly by in it. And allow some break in time. I didn't go Flowmaster because of the drone I read that it produced. If I'm not happy with the Magnaflow after some time I will switch it out.
#15
Supreme Member
iTrader: (167)
Re: New Magnaflow seems quiet
I've got a Magnaflow cat-back on my 84. While my set-up is very different than yours there's one thing I seem to notice about mine,...... the tone changes once the RPM's start climbing. IMO; It's NOT the same sound @ idle as it is @ 3K.
I gotta' guess that this is due to the muffler and not the pipes.
My Flowmaster set-ups all seem to always have the same tone. I don't mean each system sounds the same compared to each other; just that any individual Flowmaster set-up is louder or quieter depending on RPM.
I gotta' guess that this is due to the muffler and not the pipes.
My Flowmaster set-ups all seem to always have the same tone. I don't mean each system sounds the same compared to each other; just that any individual Flowmaster set-up is louder or quieter depending on RPM.
#16
Supreme Member
Re: New Magnaflow seems quiet
My magnaflow is much quieter than most flow masters at idle but about the same when I open it up. I really dont like the tone of the flow master they are always loud and drone bad when cruising. Although they do tend to make cams sound more aggressive at idle.
Personally I would get the rest of the exhaust upgraded then see how it sounds and then get what you like.
Personally I would get the rest of the exhaust upgraded then see how it sounds and then get what you like.
#18
Junior Member
Thread Starter
Join Date: Sep 2014
Location: Gig Harbor, WA
Posts: 56
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1991 Z28
Engine: L98
Transmission: 700r4
Axle/Gears: 3.73/Tru Trac
Re: New Magnaflow seems quiet
That sounds good! Mine seems a lot quieter but it only had been driven maybe 20 miles so no break in. I need to have a buddy give me a drive by.
#19
Supreme Member
iTrader: (2)
Join Date: Mar 2002
Location: San Antonio TX
Posts: 2,516
Likes: 0
Received 3 Likes
on
3 Posts
Car: 1990 G92 IROC Z Miniram
Engine: 388cu 6.4 Liters
Transmission: G-Force T5
Axle/Gears: 3.73 Gears
Re: New Magnaflow seems quiet
That's a Vortec TPI 355 with 10.3 compression with a ZZ9 TPIS cam, Dyno Don's 1 3/4in headers, dual cats and 3in cat-back Magnaflow Exhaust System. It's. OT that loud inside the car but on the outside it is a little loud at idle but tame. It will set off car alarms. The headers helps make it sing. Break in period is B.S.
Thread
Thread Starter
Forum
Replies
Last Post