Flowmaster 40 Series Delta-Flow Reviews, Ratings, Specs & Prices
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Flowmaster 40 Series Delta-Flow

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Product Information

MSRP: $250.00
Average Price: $105.45
Manufacturer: Flowmaster
Yes: 42 / No: 4


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Registered User
SEPTKSF's Reviews
10-24-2015, 05:41 PM
Price: $110.00
Pros: Great Sound, Deep Drone, you can feel it in your chest standing next to it, but not so much while driving
Cons: not sure
Recommended? Yes

Comments: Flowmaster 44 will sound great with the 8 cyl engines (4.7 and 5.7). I am not sure how it will sound on the 3.7. Drone is not too bad although I like the bass, but it sounds fantastic at startup and when you are opening it up. These jeeps idle around 550 rpms so you wont get a hotrod idle sound, but it is definitely noticeable.


Registered User
Saul32's Reviews
02-25-2014, 12:29 AM
Price: $50.00
Pros: Sounds great
Cons: None
Recommended? Yes

Comments: Perfect amount of loud from my rig. I couldn't be happier.

Registered User
spottedfrog's Reviews
08-13-2013, 07:15 PM
Price: $35.00
Pros: Sounds amazing, well constructed sturdy.
Cons: Can be a little loud when on the gas
Recommended? Yes

Comments: The Flowmaster 40 gives a very nice rumble like a muscle car. sounds deep and mellow around town. then you punch it and it get really loud. on long trips at higher RPM it is kinda annoying. the rest of the time it sounds nice. The quality is great, and the construction is solid

Registered User
xKennie's Reviews
08-07-2013, 05:31 AM
Price: $20.00
Pros: -Sounds Great -Lightweight -Durable
Cons: -Louder Would Be Nice
Recommended? Yes

Comments: Got the item in a trade. Installed it right away. The sound was nice and deep (5.2l v-8). I would have thought it would have been louder but its still nice. I had it installed in line with my stock piping. However I went back and had all the piping after the muffler removed and a turn down pipe put in place. Since then it sounds sooo much nicer. I would definitely recommend this product.

Registered User
smith0200's Reviews
02-23-2013, 05:39 PM
Price: $75.00
Pros: great throaty sound
Cons: kinda quite when you step on it, but then my banks intake takes over
Recommended? Yes

Comments: cheap, good sound, little gain in power. makes my jeep sound like a beast. especially with the tbs and cai great product

Registered User
jakemerritt's Reviews
02-11-2013, 11:27 AM
Price: $79.00
Pros: sounds good and not to loud 2.5L
Cons: small drone
Recommended? Yes

Comments: worked good easy to install on the 2.5L.

Registered User
Georgeninner's Reviews
12-09-2012, 06:46 PM
Price: $80.00
Pros: Sounds great makes my jeep sound a lot meaner
Cons: none
Recommended? Yes

Comments: I installed this looking for a more agressive and a bit louder sound from stock and it sounds like a monster and i still have lots to do to the exhaust

Registered User
jeepyj13's Reviews

08-13-2012, 09:20 PM
Price: $79.95
Pros: easy install, makes the 4.0 under the hood sound like beastly.
Cons: nothing
Recommended? Yes

Comments: Buddy had one on his old yj with a 4.0 and it sounded deep and throaty like. He didnt have a cat though, but anyways I didnt think a 6 cyl. could sound that badass so I had to get one myself. Well I finally got the 40 series deltaflow and it sounds bad to bone. It really makes the engine sound like its got some grunt to it. At low speeds it sounds like a cummins and you can't really hear it at high speeds via the wind noise, tires humming, radio blaring you know typical jeep stuff.


Registered User
Tweeter00801's Reviews
06-25-2012, 08:11 PM
Price: $40.00
Pros: Loud
Cons: Loud
Recommended? Yes

Comments: great

Registered User
BeefCj5's Reviews
03-02-2012, 12:18 AM
Price: $89.00
Pros: sounds aggressive without being an asshole
Cons: none
Recommended? Yes

Comments: It's actually a CSI Muffler I got at our local Jeep shop, similar to the flowmaster but a little cheaper price


Registered User
tkerch91's Reviews
11-22-2011, 09:35 PM
Price: $110.00
Pros: nice deep tone but not annoying!!
Cons: None!
Recommended? Yes

Comments: Great product but its rubbing on my rear shock boot so i think im just gonna do away with the boot. love the Exhaust. makes jeep little more aggressive.

Registered User
Airborn's Reviews
08-31-2011, 02:24 AM
Price: $50.00
Pros: Gives the 4.0l a nice sound
Cons: Didnt bolt right up. Should have gotten the super 44
Recommended? Yes

Comments: Sounds great. The original 40 series isnt produced in the correct inlet and outlet location. So the muffler has to be put on at an angle. I would recomend just getting the super44 since the are produced with the correct inklet and outlet location.

Registered User
04goldrubi74's Reviews
08-22-2011, 12:24 AM
Price: $150.00
Pros: good sound, not too noisy on the high way, i think just right for that good flowmaster sound
Cons: none really, makes my floor board a little hot in the rear
Recommended? Yes

Comments: I think it is a pretty good product, i think if your looking for that good loud deep sound this is the product. but it is not that loud where you can't stand it and it is easily drowned out by a little bit of low music in the cab, its pretty loud with the top off, i guess you can just hear it more, but ya, i like it a lot

Registered User
Kei_XJ's Reviews
07-26-2011, 01:59 PM
Price: $40.00
Pros: got deeper tone
Cons: none
Recommended? Yes

Comments: the FM 40 is deff muffler to get for any jeep or rig great sound and performance


Registered User
stumy71's Reviews
03-07-2011, 10:53 PM
Price: $99.99
Pros: Awesome sound
Cons: Loud when accelerating up long hills
Recommended? Yes

Comments: love the sound of the flowmaster on the 4.7


Registered User
niles6284's Reviews
02-07-2011, 11:04 PM
Price: $75.00
Pros: gives decent sound for a 4.0
Cons: +
Recommended? Yes

Comments: Sounds decent for being a 4.0 saw a few people put em on theirs thought I liked the sound, so far been on there about a year and get some decent compliments about it.. Was at a party with friends and was pulling against a Rodeo, they said mine sounded like a boat.. very hurtful. ha ha

Registered User
GetLifted's Reviews
01-28-2011, 04:41 AM
Price: $40.00
Pros: everything
Cons: nothing
Recommended? Yes

Comments: perfect replacement for stock with a turndown tip

Registered User
4ll4boutda4play's Reviews
01-21-2011, 05:40 PM
Price: $200.00
Pros: Nice sound under load with minimal drone.
Cons: Are there ever cons with exhausts ?
Recommended? Yes

Comments: Easy installed in my garage... make sure you torque down the clamps etc. Additionally ensure you have all the tubing pressed firmly together.


Registered User
tyllerrmorgan's Reviews
12-26-2010, 12:22 PM
Price: $300.00
Pros: sounds awesome
Cons: none
Recommended? Yes

Comments: love my flowmaster, the rest is new stock cat, and flow tailpipe


Registered User
TJ-Tera's Reviews
10-14-2010, 05:29 PM
Price: $1.00
Pros: More agressive sound, and flows better than stock.
Cons: Mild drone.
Recommended? Yes

Comments: I am still debating whether I want to go Magnaflow...think I will when I have the $ saved up.

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