i have a 3" single gibson exhaust originally till the muffler blew the
baffles out..then I put a 3" flowmaster 2 chamber on it. Plenty of
backpressure from what i can feel.. and i still get a very strong vacuum
signal.
~ Paul
98 Dak, RC,Deep Amethyst
V8/5 Speed/ 3.91 Suregrip
----- Original Message -----
From: "Andy Levy" <andylevy@yahoo.com>
To: <dakota-truck-moderator@bent.twistedbits.net>
Sent: Thursday, September 06, 2001 10:37 AM
Subject: Re: DML: Re: Aftermarket Muffler Options
> It's not even that specific. If you relieve too much backpressure, you'll
lose
> power. If you have too much backpressure, you'll lose power. Finding the
sweet
> spot is part science, part black art. So far, we know that for a stock to
mildly
> modified engine, a single 3" is really nice. To go larger, you'd better
have
> serious engine work (I think the ViperTruck has 3 1/2" or 4", but Austin
has more
> than a little work on that thing).
>
> Once you get into duals, things get even trickier. Stock, I think you've
got a
> 2.5" pipe, which works out to 4.90625 sq. in. cross-section. Dual 2"
pipes have
> a total cross-sectional area of 6.28 sq. in. Dual 2.5" is 9.8125 sq. in.
A
> single 3" is 7.065 sq. in. A dual 3" is 14.13 sq. in. So a dual 3" will
leave
> you with precious little backpressure, and your truck will be a slug.
2.5" is
> probably the largest you can safely go on duals, and 3" on a single pipe,
> without major engine work. I know quite a few people are running a
Gibson
> dual-exit on their V8s with good results.
>
> If I'm all wet here, please let me know, folks.
>
> Paul Macey wrote:
>
> > On Thu, 6 Sep 2001, Sterling wrote:
> >
> > > Stick with flowmaster, I got a Ravin, it sounds great outside but the
incab
> > > noise level is nearly unbarable. And who says you can't put a 3" on
any
> > > model of Dakota?
> >
> > I thought it depended on single -vs- dual exhaust, and for the 4.7, a
dual
> > 3 inch exhaust would actually rob you of power and decrease HP and/or
> > torque.
> >
> > For best performance gains for the 4.7, believe the common thought is to
> > go with a 3 inch single exhaust.
> >
> > Now as regards to gibson -vs- flowmaster on the single exhaust, I've
seen
> > quite a few posts saying people were disappointed with the gibson (not
> > much louder than stock) and took them off and re-installed a flowmaster
> > setup.
> >
> > > ----- Original Message -----
> > > From: <s_villaire@yahoo.com>
> > > To: DML <dakota-truck@buffnet.net>
> > > Sent: Thursday, September 06, 2001 8:21 AM
> > > Subject: DML: Aftermarket Muffler Options
> > >
> > >
> > > >
> > >
> > >
>
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