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Old 02-07-2006
johnson's Avatar
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best size tubing for exhaust.

Im doing a side exit exhaust on my 1999 3.0l v6 ranger. Im taking out the cats and putting in a flowmaster 40 series. I just need to know what size flowmaster to get. Is there a plus of having two different sizes of in and out on a flowmaster. Is like 2 inch or 2.5 better, or any size. I dont want it to big to loose back preasure.

thanks for all of your help..
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Old 02-07-2006
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Join Date: Mar 2005
Location: Dearborn Michigan
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I just got the flowmaster 40's on my truck Single in dual out.
I have 2.5 in and 2.25 going out.

My friend from school has the 3.0 and he said he's got like 3 inch pipes..i dont no if i would go that big tho.
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Old 02-07-2006
Join Date: Apr 2005
Location: Shelbyville, Kentucky
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not 100%, but i think stock is 2.25"

i'm getting ready to do the same thing to my truck, just with a Borla ProXS, and i'm sticking with 2.25 all the way back
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Old 02-07-2006
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Join Date: May 2004
Location: Hanover, Maryland
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Leave the cat's, you'll perform better and have better mileage. Don't argue, search, and do research.

For the 3.0, I'd run about 2.25. I ran 2.25 on my OHV 4.0 and 2.5 on the SOHC..both exited infront fo the rear passenger tire.
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Old 02-07-2006
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Join Date: Apr 2005
Location: Valrico, Fl 33594
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^x2, dont argue.

2.25 mandrel bent pipes. flowmasters compromise backpressure andgas mileage for sound. unless your point is to be really loud, I'd recommend looking at other mufflers
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Old 02-07-2006
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Join Date: May 2005
Location: Irvine, CA
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w/ your 3.0 run 2.25" piping. I disagree w/ the anti flowmasters on the basis that most people get a damn muffler for the sound(atleast on a 3.0 ranger). You wont loose any power over stock using a flow
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Old 02-08-2006
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Join Date: Oct 2005
Location: Warren, Pa
Posts: 672
I ran 2.5" pipe from the cat to the muffler, then dual 2.25" piping out the back with 3" tips.

I decided to keep my cats on (have to) and went with a SS Magnaflow muffler. Sounds, and performs great.

PS - If needbe, an exhaust clip is in my sig. :)
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Old 02-08-2006
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Join Date: Jun 2004
Location: Delaware
Posts: 8,238
keep your cats and use 2.25 inch pipes from the muffler back and 2.5 inch pipes from headers to the muffler... that is what you have stock and it will produce the best sound and performance
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