[DeTomaso] Muffler Opinions

[Pantdino]

Keep in mind that the resistance of airflow through a tube is inversely related to the diameter of the tube raised to the fourth power.

So decreasing the diameter to half as big does not double the resistance but rather makes it 16 TIMES greater.
I believe this is true no matter how long the tube is, the length having a much lesser effect.

So my point is that the SMALLEST point in the whole system will determine the resistance.
There is no point in having 3" tubing if the muffler narrows to 1.5" somewhere inside-- the resistance will be determined by that narrowest point.  If I were shopping for mufflers I would keep that in mind.  

I hadn't thought about it until now, but this also means that two 1" pipes do NOT have the same resistance as a single 2" pipe. Splitting a single 2" pipe into two 1" pipes would logically result in increasing the resistance by a factor of 8.  (Half the change of decreasing to a single 1" pipe.)

I'll let some else do the calculations for what the change is for 2.5 to 3"     (2.5 to the fourth power compared to 81)

Jim Oddie




-----Original Message-----
From: Steve Hawkins <shawkins777 at comcast.net>
To: michael at michaelshortt.com; 'Will Kooiman' <wkooiman at earthlink.net>
Cc: 'Pantera List' <DeTomaso at realbig.com>
Sent: Sun, Aug 1, 2010 11:15 am
Subject: Re: [DeTomaso] Muffler Opinions


I have Magnaflows on mine and love them.  Single inlet and dual outlet, full
low and sound great.
Steve
-----Original Message-----
rom: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
ehalf Of michael at michaelshortt.com
ent: Sunday, August 01, 2010 7:57 AM
o: Will Kooiman
c: Pantera List
ubject: Re: [DeTomaso] Muffler Opinions

onza dual outlets with the baffles "adjusted", the look is classic, the
ound is great and if they are jethot coated, the lifespan is long. Michael
hortt
On Jul 31, 2010 11:51 PM, "Will Kooiman" <wkooiman at earthlink.net> wrote:
I had Borla XR-1's, and they sounded great.  They are 3" in, 3" out, and
bout the same size as the original mufflers.  I sold them because I'm going
o 180's.
I like the sound of gutted stock mufflers.  I don't think they flow any
etter, but the sound is a lot better.
The mind train exhaust sounds great, but it's also very loud.
There's a magnaflow muffler that is about the right size to fit in the stock
ocation.  It has 2 2.5" inlets and 2 2.5" outlets.  You have to make your
wn y-pipe for the inlet.
You could make your own... gut some stock mufflers, increase the inlet to
.5" or so, and replace the resonators with something that muffles, but
oesn't choke.
3" pipes fit.  It doesn't look difficult to take 3 u-bends, cut them just
ight, and snake them through the suspension.  2.5" is probably big enough,
hough, and would fit better.

----Original Message-----
rom: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com]...
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