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hardbody
Dodge Dakota
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5/20/2002
00:07:38
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 Subject: exhaust pipe size ?
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Message:
hello I need opinions on something a muffler shop told me, I went to a shop to see if they would remove my 3rd cat, the owner said he would but told me I might want to wait until I put more mileage on it for warranty reasons, so I said no problem but I still want the truck to sound louder. OK here's what I want opinions on:: First I have the 4.7 with the flowmaster cat back system, 3" tailpipe with 50 series suv muffler. We talked about replacing the 50 series muffler with a 3" 40 series, I'm ok with that but he said if I increase the pipe size from the cat to the muffler to 3" it would make it louder. I called flowmaster when I got home and asked them they said they don't advise making the pipe 3" because the engine doesn't make enough exhaust to fill the 3" pipe and I would lose my low end. I called Borla they basically said the same thing, tech told me "our cat back is all 2.50" Than flowmaster tells me they discontinued the 3" 40 series and I would have to use the delta flow 40 series. Can anyone tell me about the going to 3" pipe making it louder or killing the low end???? Sorry so long
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D
Dodge Dakota
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5/20/2002
01:20:21
| RE: exhaust pipe size ?
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Message:
I got my intake before I switched to 3" pipe, so
I didnt notice any loss of power, but man is it
loud! the 40 series muffler is probably a two
chamber muffler anyway, so you shouldnt
have a problem with loss of back pressure.
My Dynomax has a straight through design,
and sounds/performs great.
I beleive the general consensus is to do
intake before exhaust, but you can drive to the
local hardware store and build one yourself
for under $30.00 add a K&N filter and you're
set.
D
01/4.7/CC/airaid+3"homebrewed/180stat/Jet2
TBspacer/ported-polished68mmTB/Dynomax
RaceWeldedMuffler+3"catback/NoClutchFan/
DJMdrop3-6
HO intake, HO cams, Sure Grip Limited Slip
are in the mail ! ! ! ! ! ! !
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xplikt
Dodge Dakota
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5/20/2002
10:46:48
| RE: exhaust pipe size ?
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Message:
A bigger pipe with not enough air flow -- yet anyways; higher rpms will fill it -- wont be traveling through it as fast as if it were smaller. If it's bigger, obviously a lot more air can get through and there will not be any restrictions as if it were smaller.
Freeing up the exhaust also effects other things, but I do not have a solid grasp on the valvetrain -- yet.
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hardb0dy
Dodge Dakota
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5/20/2002
21:56:36
| RE: exhaust pipe size ?
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Message:
I made a home made intake using a K&N filter allready, I'm just trying to find out who's right with what i was told I, e-mailed KRC and speed tweaks to see what they say but neither one has responded yet. I would like to ask someone who really knows but don't know who to ask.
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CW
GenIII
5/20/2002
22:26:27
|  RE: exhaust pipe size ?
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Message:
Keep the flowmaster 50 series but cut out the cat and keep it 2.5". It will be louder.
2001 4.7HO RC 5sp 3.92 LSD
Click on thumbnail for mods.
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hardbody
Dodge Dakota
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5/20/2002
22:35:54
| RE: exhaust pipe size ?
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Message:
Ok as far as removing the 3rd cat will that automatically void my warranty? or is it like aftermarket parts where they can only deny a warranty claim if they can show that the aftermarket part caused the problem?
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xplikt
Dodge Dakota
JOIN HERE
5/20/2002
23:24:12
| RE: exhaust pipe size ?
IP: Logged
Message:
Removing it will void the warranty on the cat obviously, but shouldn't on anything else. However, remember that it can be illegal depending on what you replace it with etc.
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