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flowmaster 40 series

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Old 08-17-2009, 12:30 AM
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Default flowmaster 40 series

Are these as bad as far as restriction goes as the 80 series? Does anyone have any testing on these in an H pipe setup? Im considering replacing my current dynomax pro flow mufflers with flowmaster 40's and want to know if I stand to gain or loose.
Old 08-17-2009, 08:07 AM
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I currently have the 80 series and they are the worst sounding muffler I have ever heard. Changing to the loudmouth 1 this week.
Old 08-17-2009, 10:02 AM
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Not sure about restriction but I do know that they dont sound good.
Old 08-17-2009, 11:08 AM
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Originally Posted by bledsoe01
I currently have the 80 series and they are the worst sounding muffler I have ever heard. Changing to the loudmouth 1 this week.
Just wait. You'll soon HATE that Loudmouth junk and wish you kept the Flowmaster on there.

And to the OP: the 40 and 44 series mufflers are nowhere near as bad as the crossflow.
Old 08-17-2009, 08:42 PM
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40's and 44's sound sweet and flow good ... dont flow like a bullet, but plenty good

they are big, if you are thinking about duals.
Old 08-17-2009, 08:50 PM
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Originally Posted by Full-Force
40's and 44's sound sweet and flow good ... dont flow like a bullet, but plenty good

they are big, if you are thinking about duals.


yea they do sound good specialy duals
Old 08-17-2009, 10:14 PM
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not to worried about clearance. I sectioned the floor beneath the rear seats and gained almost 4 inches of clearance, Right now Im running the full size dynomax pro flow (bigger than flowmasters) and I have better clearance than I did with a y pipe.
Old 08-18-2009, 04:58 PM
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Pictures of the sectioned floor lol
Old 08-18-2009, 06:07 PM
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Originally Posted by Gordo78
Pictures of the sectioned floor lol




On the inside I still have the rear seats, only had to trim a little off the inside edge of each seat. No one has ever noticed a difference in the seats.
Old 08-18-2009, 07:07 PM
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I sectioned mine too. Mine is not flat like yours cuz I just bfh the heck out of it.

I do plan to cut mine out eventually just haven't gotten around to it.
Old 08-20-2009, 10:41 AM
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I have the Magnaflow Catalytic Converter 45420, I purchased it direct here. Magnaflow Catalytic Converter 45420, I have no comlaints with this cat I passed emissions and got not engine code errors so Im happy. You would not believe what the dealer wanted to charge me for this thing. Definately buy online and put it on your self its way cheaper.
Old 08-20-2009, 10:43 AM
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Originally Posted by kevinGTB1
I have the Magnaflow Catalytic Converter 45420, I purchased it direct here. Magnaflow Catalytic Converter 45420, I have no comlaints with this cat I passed emissions and got not engine code errors so Im happy. You would not believe what the dealer wanted to charge me for this thing. Definately buy online and put it on your self its way cheaper.
spam!!!!!!!!!!!!!!!
Old 08-20-2009, 03:12 PM
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My wife has a deltaflow 40 on her Durango and it sounds good and you can hear it from down the street, although its a truckish sound. I have heard another 40 series on a H/C Z28 dumped straight off the y and that **** sounded badass.




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