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Flowmaster 40 + 2 cats removed

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Old 01-05-2013, 12:17 AM   #1
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Flowmaster 40 + 2 cats removed

So a few days ago I decided to get my exhaust redone, I removed 2 out of the 4 cats on my 4.0L. I removed a cat on either side of the headers, right after the sensors, that way the engine/computer would not know the difference. So my new set up is 2 stock cats piped into a single pipe using a custom made Y pipe, then its piped into a flow master single in/out 40 series muffler, and dumped before the axel. All the piping was custom welded and bent to have as little creases and bends as possible, to maximize air flow.

Seeing there are 2/4 cats, i still get enough back pressure to not lose noticeable low end power/torque seeing on a NA engine, some back pressure is good. But where i really noticed the difference was high end RPM, where the increase air flow helps. It has this quickness and agility about it at higher speeds now, and i love it. so the combination of back pressure and air flow has been great so far.

MPG wise, i will give an update when i have time to go through a tank of gas on regular drives, but for now im enjoying my exhaust and have been getting on the throttle a lot!! Also i just installed a BakFlip so i will see how the combination goes.

Sound wise, i love it. I've had LOUD vehicles, from a 89 blazer with a 350 block engine, no cats, and a flowmaster, to a WRX tuned for 300+ WHP, straight piped from the turbo, no cats or muffler... so i have had LOUD and OBNOXIOUS vehicles... but this combination sounds awesome. Its loud when you hit certain throttle percentages, but when cruising it mellows out. During idle it sounds nice (ALSO lowered my idle rpms), when WOT, its got this turbine sound to it and throaty sound. Sounds amazing, and my dad who has a magnaflow on a hemi ram, said that for a V6, it sounds beastly.

So overall, i am super happy with the results of my exhaust modifications.
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Old 01-05-2013, 12:34 AM   #2
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Quote:
Originally Posted by Annolino122 View Post
So a few days ago I decided to get my exhaust redone, I removed 2 out of the 4 cats on my 4.0L. I removed a cat on either side of the headers, right after the sensors, that way the engine/computer would not know the difference. So my new set up is 2 stock cats piped into a single pipe using a custom made Y pipe, then its piped into a flow master single in/out 40 series muffler, and dumped before the axel. All the piping was custom welded and bent to have as little creases and bends as possible, to maximize air flow.

Seeing there are 2/4 cats, i still get enough back pressure to not lose noticeable low end power/torque seeing on a NA engine, some back pressure is good. But where i really noticed the difference was high end RPM, where the increase air flow helps. It has this quickness and agility about it at higher speeds now, and i love it. so the combination of back pressure and air flow has been great so far.

MPG wise, i will give an update when i have time to go through a tank of gas on regular drives, but for now im enjoying my exhaust and have been getting on the throttle a lot!! Also i just installed a BakFlip so i will see how the combination goes.

Sound wise, i love it. I've had LOUD vehicles, from a 89 blazer with a 350 block engine, no cats, and a flowmaster, to a WRX tuned for 300+ WHP, straight piped from the turbo, no cats or muffler... so i have had LOUD and OBNOXIOUS vehicles... but this combination sounds awesome. Its loud when you hit certain throttle percentages, but when cruising it mellows out. During idle it sounds nice (ALSO lowered my idle rpms), when WOT, its got this turbine sound to it and throaty sound. Sounds amazing, and my dad who has a magnaflow on a hemi ram, said that for a V6, it sounds beastly.

So overall, i am super happy with the results of my exhaust modifications.
just curious, the 40 series is chambered right?

instead of straight through like a magna?
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Old 01-05-2013, 12:59 AM   #3
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Quote:
Originally Posted by Justus View Post
just curious, the 40 series is chambered right?

instead of straight through like a magna?
Yes, I have the same muffler. Im not sure if it bad or good to be chambered though.
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Old 01-05-2013, 07:52 AM   #4
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Chambered is correct... And all the chamber does is redirect flow for sound. Not too big of a deal
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Old 01-05-2013, 07:55 AM   #5
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That way... Instead of using a material like a cat, it won't wear over time. There is no "breaking in" the muffler.
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Old 01-06-2013, 03:19 PM   #7
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I will tonight. Been busy sorry
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Old 01-06-2013, 03:40 PM   #8
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I'm interested to see if u have any major changes in mpg.....keep us updated!
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Old 01-07-2013, 09:39 AM   #9
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Let me know if these come out clear
Attached Thumbnails
Flowmaster 40 + 2 cats removed-img_1214.jpg   Flowmaster 40 + 2 cats removed-img_1215.jpg  
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Old 01-07-2013, 09:40 AM   #10
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And I'm almost empty on gas, so when i fill it... ill drive normally and get you guys an update on MPG
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Old 01-07-2013, 06:18 PM   #11
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post a video with some nice sound clips
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Old 01-07-2013, 06:33 PM   #12
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Quote:
Originally Posted by Annolino122 View Post
Chambered is correct... And all the chamber does is redirect flow for sound. Not too big of a deal
it fucks up the engineered scavenging of the exhaust, thus causes a loss of hp.
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Old 01-09-2013, 03:48 PM   #13
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http://www.youtube.com/watch?v=QVGvKSuVnrg

Havent had time for a full video but heres idle and rev
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Old 01-15-2013, 05:49 PM   #14
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Went 249.4 miles on 11.6 gallons of gas... average of 21.5 MPG's.

This is even in a mtn town, with slow speeds and a lot of stops and goes.

Not bad for the exhaust and bak flip addition
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