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Go Back > Reviews > Engine > Exhaust > Flowmaster Flowmaster series 40

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Flowmaster Flowmaster series 40 Reviews, Ratings, Specs & Prices
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Exhaust Next Product

Flowmaster Flowmaster series 40

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Product Information

MSRP: $500.00
Average Price: $124.89
Manufacturer: Flowmaster
Yes: 109 / No: 2

Flowmaster series 40 muffler, This is the most “aggressive” sounding street/strip muffler that Flowmaster offers. If you're looking for attention, this one will get you noticed. The standard 40 series has an “aggressive rumble" and will generally resonate inside the vehicle around 1800-2000 rpm’s, and again at 2400-2600 rpm’s. Constructed of 16 gauge aluminized steel and fully mig-welded for maximum durability


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Registered User
SouthGA_TJ's Reviews
08-17-2015, 01:07 PM
Price: $70.00
Pros: Sounds awesome cheaper than a magnaflow
Cons: none so far
Recommended? Yes

Comments: Sounds awesome I'm running it with no CAT so it might be louder than most. Has a nice tone and volume you can hear it when I get on it.

Registered User
iamjustbill's Reviews
02-04-2015, 12:54 PM
Price: $150.00
Pros: Great product. Nice deep rumble
Cons: none
Recommended? Yes

Comments: Nice sound. Deep rumble


Registered User
Ruthless1's Reviews
08-08-2014, 01:42 PM
Price: $1.00
Pros: Great flow and great sound
Cons: Nothing bad to say at all
Recommended? Yes

Comments: I have always used flowmaster on my older cars and trucks. Don't have anything bad to say about them at all

Registered User
Dwarvenpyro's Reviews
05-25-2013, 12:50 PM
Price: $130.00
Pros: Sounds great, loud but not too loud
Cons: some drone but not much
Recommended? Yes

Comments: Price was with install. I only replaced the muffler. Kept the stock piping. Great. Loud but not overly loud. Has a mean growl to it. Love it.

Registered User
Rhigondus's Reviews
01-16-2013, 11:51 AM
Price: $50.00
Pros: sounds great
Cons: nada
Recommended? Yes

Comments: really brought some grol out of my inline 6

Registered User
zrultima's Reviews
12-31-2012, 07:28 PM
Price: $450.00
Pros: Cheap
Cons: Flows terrible worst exhaust to have for power gains
Recommended? No

Comments: This is one of the worst exhaust to have on an LS Motor due to restrictions in the mufflers they do have a great sound but not worth it in the end

Registered User
rancho_26's Reviews
09-09-2011, 07:55 PM
Price: $130.00
Pros: Sounds a lot better.
Cons: None.
Recommended? Yes

Comments: I don't know the actual price of the exhaust. The guy at the muffler shop took of my cat, welded my lines shut that go to the pulse air system, and put my exhaust on for just $130. My Jeep sounds a lot better especially since it completely broke in. It sounds like it's suppose to. It doesn't sound "modern" like a new Jeep, but it sounds like an older Jeep.

Registered User
Airborn's Reviews
08-31-2011, 02:28 AM
Price: $50.00
Pros: sounds great on the 4.0l
Cons: should have gotten the super 44
Recommended? Yes

Comments: Sounds good but since the original 40 series isnt produced in the correct inlet and outlet location for a jeep, it has to be put on at an angle. I should have just gotten the super44 since it comes in the correct inlet and outlet location.


Registered User
xlTravislx's Reviews
06-16-2011, 04:38 PM
Price: $70.00
Pros: sounds good
Cons: nothing
Recommended? Yes

Comments: i love the sound

Registered User
RedXJ119's Reviews
06-03-2011, 10:14 PM
Price: $20.00
Pros: obvious
Cons: none
Recommended? Yes

Comments: gives it some sound and performance... whats not to love


Registered User
B0YDe's Reviews
03-03-2011, 09:21 PM
Price: $80.00
Pros: great deep sound, not brappy like a ricer
Cons: requires some welding and some playing around to get secure fitment
Recommended? Yes

Comments: requires some welding and some playing around to get secure fitment...after install i couldnt be happier with the product

Registered User
txdrumer's Reviews
12-21-2010, 04:37 PM
Price: $120.00
Pros: Sounds great
Cons: none
Recommended? Yes

Comments: Was on the jeep when I got it, but it makes that little 4-banger sound great

Registered User
gunnerscherlin's Reviews
11-29-2010, 08:35 PM
Price: $50.00
Pros: Great sound and low rumble at idle
Cons: none
Recommended? Yes

Comments: Great muffler has great sound and tough as nails.

Registered User
mmachac's Reviews
11-16-2010, 12:54 PM
Price: $100.00
Pros: added power and deep sound
Cons: none
Recommended? Yes

Comments: i have made a 2.5" pipe from the header to a flowmaster 40 series, no cat and i love it. its loud but awesome sounds mean. and gained power from it

Registered User
Sambox's Reviews
05-24-2010, 12:23 PM
Price: $1.00
Pros: It sounds good with a slow, steady acceleration.
Cons: Real annoying for stop and go driving. The sound cruising at 30mph is also annoying.
Recommended? Yes

Comments: The system was installed on the jeep when I bought it. To be honest, if it weren't for the seeming performance boost, I would remove it. It's kind of annoying.


Registered User
TennesseeTJ02's Reviews
02-02-2010, 02:54 AM
Price: $100.00
Pros: It sounds great
Cons: none so far
Recommended? Yes

Comments: It has a nice tone to it.


Registered User
_Kevin's Reviews
11-06-2009, 04:21 PM
Price: $30.00
Pros: Got it used cheap from another Jeeper, great sound
Cons: Little bit of rattling from a loose baffle
Recommended? Yes

Comments: Sounds great, even on my little 2.5l. Got it used from another Jeeper off this website, and I really couldn't be happier. Muffler cost me $30 w/ shipping, then $18 to have it put on, can't beat that. Cost me $48 with shipping and installation when a lot of websites charge ~$100 just for the muffler itself. If you can find a used one at a good price, go for it. When I finally get a bigger engine in my baby I'm going to go and buy a brand new one, same model.

Registered User
Jasen's Reviews
06-05-2009, 11:18 PM
Price: $280.00
Pros: Added proformance and a little throte
Cons: none
Recommended? Yes

Comments: I replaced the OEM with a flowmaster cat back system when the OEM gave out after 4 years. Haven't looked back the last 7 years.

Registered User
squidman's Reviews

04-05-2009, 03:02 PM
Flowmaster Flowmaster series 40
Price: $100.00
Recommended? Yes

Comments: nice muffler i would recomend it to any one who wants a mellow nice sounding muffler

Registered User
99GeePTJ's Reviews

03-28-2009, 12:17 AM
Flowmaster Flowmaster series 40
Price: $230.00
Recommended? Yes

Comments: Great, better flow and the sound is worth it alone. I wonder how this exhaust will sound with a stroker?! may want a 60 series.

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