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Old 01-24-2007
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pipe size

ive decided to put the 40 series on my truck and i was wondering would 2 inch be good or 2.25 be good ? ive heard 2'' pipe is best because it makes more of a back pressure resulting it sounding better. what would you reccomend? ive heard 2.25'' sounds the best but wondering does anyone here have 2''? thanks.
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Old 01-24-2007
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i think most everyone goes with 2.25 like the rest of the piping...
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Old 01-24-2007
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ok cool, thanks Justin. just wanted to see if anyone had experienced with this size of piping.
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Old 01-24-2007
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It is best to have a bigger pipe going into the muffler and smaller one coming out, that keeps the velocity up. Is this a single out application? I would say go 2.5 in and 2.25 out, or 2 out if you are going duals. You can always put bigger tips on the end, that will give it a deeper louder sound by acting like a megaphone......
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Old 01-24-2007
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ive heard with my 3.0 to go 2.25 all the way through though. 2.5 into 2.25 sound any different?

im going to be running duals.
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Old 01-24-2007
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I run 2.50 after the cat, no muffler but it sounds great, I will be replacing the muffler very soon (tax money?) and I will probably keep the 2.50 after that and run it to a 3in tip like usual. I also have the 4.0
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Old 01-26-2007
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ok so for the best sound go single in 2.5 into 2.25'' dual out ? who has this set-up ? and what you think ?
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Old 01-26-2007
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Do you have a local shop that does dyno tuning. He can tell you what is the best setup for most componenets if he has done a lot of dyno runs. Many time what we or others think isn't what the dyno tells.
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Old 01-26-2007
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that is true , but i really just want the best sound possible not that honda civic sound with a coffee can on it. know what i mean ? and a lot of people here run a similar set up so i just want to know what is the best? the single in im not sure about, but the dual out i know people said 2.25'' gives best sound/performance.
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Old 01-26-2007
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It is hard to tell you what the best sound will be, I love my flowmaster on my 4.0 with a 3" tip, it is nice and deep and idle and under 2000 rpms. No matter what you get, if you want it deep, you will want something like a 3 inch tip on the end......
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Old 01-26-2007
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you have a sound clip of your exhaust graygoose?
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Old 01-26-2007
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on my 4.o i cut off the flange after the cat and ran 2.5" tubing all the way to the 3" inlet for the flow 40. right now it is dumped but i plan on welding up some pipes that exit infront of the pass. tire. the flow is si (3")/do(2.5"). right now it sounds great, nice and very deep at low rpm's and i was surprised that there was only a very slight loss in lower end torque (but the bigger pipe made up for it every where else). and i found that from that stock flange back to the muffler the pipe was 2" OD. everyone else here seems to have 2.25" stock...huh
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