FlowMaster Super 40 series Reviews, Ratings, Specs & Prices
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FlowMaster Super 40 series

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Product Information

MSRP: $350.00
Average Price: $108.63
Manufacturer: FlowMaster
Yes: 81 / No: 0

This muffler has a very good sound. I am using the 2 1/2 inch tubing and duel exhaust and the mufflers sound great. They are a little loudr then the regular 40 series.


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Registered User
YJOklahoma's Reviews
02-06-2016, 06:00 PM
Price: $100.00
Pros: Sounds awesome
Cons: None
Recommended? Yes

Comments: Love this muffler

Registered User
aj2494's Reviews
02-06-2015, 07:24 AM
Price: $40.00
Pros: Definitely loud on acceleration, but quiets right down and doesn't drone too bad.
Cons: A little ricey sounding at times.
Recommended? Yes

Comments: I've been very happy with this. It's pretty loud, but isn't crazy and definitely sounds good for an I6.

Registered User
JPXJMOAB's Reviews
01-03-2015, 07:15 PM
Price: $100.00
Pros: Great sound, Easy to install. Very well constructed and heavy duty.
Cons: I wouldve liked a little deeper tone. (I only did cat-back with 2.5 inch pipe)
Recommended? Yes

Comments: Overall i have to say i am very happy with the product, great investment!

Registered User
tightjibbs's Reviews
03-03-2014, 05:39 PM
Price: $200.00
Pros: Sounds great
Cons: None
Recommended? Yes

Comments: Has that great FLOWMASTER rumble

Registered User
SKELITOR117's Reviews
01-29-2014, 11:29 PM
Price: $90.00
Pros: Very aggressive deep tone, loud enough to enjoy with windows down, quiet enough to ignore with windows up. Deep bass tone, no rice burner noise at high rps (like Super44), very good for cruising around, good power.
Cons: None that I can think of. Come up with one and I'll rip your arms off.
Recommended? Yes

Comments: INSTALL BY PROFESSIONAL WELDING! ($60-$70 at shop)!!! Very aggressive deep tone, plenty loud enough to enjoy with windows down, quiet enough to ignore with windows up. Deep bass tone, no rice burner noise at high rps (like Super44), very good for cruising around, good power. Here is what it really sounds like, listen to on GOOD sound system loud. http://www.youtube.com/watch?v=kyn-L2jL_LA (P.S. Suggest paring with K&N stock air filter replacement and modify cold air box with circular drill bit holes (face away from engine. (Block off areas where it sucks hot air from engine bay/radiator hoses with cardboard wrapped in tin foil or something.)

Registered User
a77ferrel77's Reviews
08-18-2013, 11:01 PM
Price: $89.99
Pros: Sounds Great, not too loud, has the deep throaty sound to it.
Cons: None
Recommended? Yes

Comments: What can i say Flomaster makes probably the best aftermarket mufflers out there. The Super 40 series muffler has a great deep throaty sound to it that everyone loves. Really easy to install, helps a lot to have a welder handy to weld the muffler on and to add a section of exhaust tubbing since the muffler isn't the same length of the stock one.

Registered User
dougmorgan99's Reviews
06-20-2013, 06:06 PM
Price: $80.00
Pros: Sweet V8 rumble, rumble...
Cons: None
Recommended? Yes

Comments: Got it with my Iron Rock Offroad 3" Exhaust Kit. I am very pleased with it.

Registered User
Seadooer's Reviews
05-18-2013, 09:45 AM
Price: $60.00
Pros: Sounds Amazing with the 4.0L
Cons: It drones a bit right at 2000 rpms
Recommended? Yes

Comments: asdfnkasndf'lnaskdfn'asndf'aksdnfa'sndfioasdfaskdi fnaksefdiol lfvcazsdnlvfogawsol;edfnva'/l;soedrgwnhfi;l'/sdrnfvga'olsw[iehdnlvfg'loa[weiuhrsdnfvlg'/azewsruhdngfvl'azesdrifghjntazolws'/;edrgtiufhajnszdklfgv[

Registered User
kevinhascall's Reviews
03-11-2013, 12:14 AM
Price: $50.00
Pros: Cheap price and mounts up easy.
Cons: Not very loud even when broken in. Going to need to delete a resonator to sound like I want.
Recommended? Yes

Comments: The muffler isnt very loud but thats how it is made. I wish that it was a little deeper but for 50 bucks you cant go wrong.

Registered User
Marksman113's Reviews
03-03-2013, 11:04 PM
Price: $1.00
Pros: very nice sound
Cons: none
Recommended? Yes

Comments: i love the sound it gives my jeep, but im going to true dual so it may be come off, i really like it though


Registered User
1996ZJI-6's Reviews
03-03-2013, 10:04 PM
Price: $212.00
Pros: loud, deep, gives the jeep a very manly sound
Cons: quiets out to quick
Recommended? Yes

Comments: i love my flowmaster but is starting to quiet out and sound like it has a leak in it.

Registered User
blakeg38135's Reviews
02-17-2013, 10:57 PM
Price: $91.99
Pros: sounds amazing
Cons: the price
Recommended? Yes

Comments: sounds amazing easy install

Registered User
greenslate18's Reviews
02-14-2013, 12:23 AM
Price: $75.00
Pros: great sound!
Cons: none so far
Recommended? Yes

Comments: i have the 3.7 v6 and sounds great! has the perfect tone for me! great price too!

Registered User
GTO71's Reviews
11-25-2012, 07:23 PM
Price: $80.00
Pros: Sound
Cons: None
Recommended? Yes

Comments: Love them sounds very much like a 90's 5.0 Mustang with flowmasters.

Registered User
TheLawnNinja's Reviews
05-12-2012, 03:18 PM
Price: $120.00
Pros: sounds awesome
Cons: none
Recommended? Yes

Comments: what more can you ask for go with the best flow master

Registered User
Airborn's Reviews
04-22-2012, 01:37 PM
Price: $63.00
Pros: Sounds great
Cons: none
Recommended? Yes

Comments: Most aggressive sounding muffler flowmaster offers so it sounds good on 4.0l, 5.2l, and 5.9l

Registered User
ivester1992's Reviews
03-04-2012, 07:03 PM
Price: $80.00
Pros: sounds great
Cons: have to have it welded in
Recommended? Yes

Comments: this made my little 4 banger sound great im super satisfied with it

Registered User
rubicon1983's Reviews
02-17-2012, 11:16 PM
Price: $340.00
Pros: mean sound love it very loud !!
Cons: no cons i bough tit for sound but id like 44 offroad diamond plated
Recommended? Yes

Comments: very wicked product will def buy again in future


Knuckle dragger
ThomasYJ's Reviews
01-29-2012, 05:46 PM
Price: $100.00
Pros: GREAT Sound!! Good flow stainless steel
Cons: Not loud enough?
Recommended? Yes

Comments: Like everyone else has said, I Loove this thing!! Give it a week or two, idk Id say a few hundred miles, to really break in. I had the shop build a custom pipe that is 2.25" for about 18" from the header then open up to 2.5" to keep some low end torque and alleviate the flat spot off idle found in straight 2.5" kits. Also had them cut the pipe right before the last bend to go out the back.
It was kinda quiet at first but now it's good. Has a nice low grumble at the bottom end, good tone at around 1500rpm. Cruising on the highway at around 2krpm you can tell it's there but its not obnoxious. You can definitely carry on a conversation or hear your music.
Only complaint is maybe its not loud enough for me? haha perhaps a super 44 or something similar is in my future.


Registered User
Desert_Rampage's Reviews
12-02-2011, 06:57 PM
Price: $1.00
Pros: Great sound.
Cons: None so far
Recommended? Yes

Comments: Installed by the PO. I like it so far.

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