I'm under the same belief and having the same problems with modifing the
y-pipe. I've done more than my share with modifying street cars and the 4.L
DAK has the worse looking Y-pipe set up I've seen, well may be second to the
SHO. A good 2 1/2" mandrel bent y-pipe with hi-flow cats should net a lot
of HP. Glad to hear that the stock casting is smooth, this means I need to
only concentrate on the exhaust and not the headers, but like Matt says ",
nobody will touch the Y-pipe"
----- Original Message -----
From: <WMBARRET@aol.com>
To: <dakota-truck@buffnet.net>
Sent: Saturday, March 10, 2001 4:51 PM
Subject: Re: DML: 4.7 Borla Headers; Big Disappointment
> Hey Paul, sorry about the disappointment! After hearing about the
expected
> 5-10 hp gain from headers a while back, I decided not to go this route. As
> you said, the factory manifolds probably flow very good! I took a close
look
> at a 4.7L engine that was on display at Daytona last month, it had the
> manifolds on. I took a very close look at them, and man those things look
> smooth, and they are short.After seeing them this close I can see where
you
> are coming from. You might throw one in the truck when you come to VMP
next
> Sat. for everyone to see!!
> I've been trying to find an exhaust shop who will rework my factory
Y-pipe.
> To me, it looks very restrictive, and the pipe dia. is about 2". I
believe a
> reworked Y-pipe, and getting rid of that 3rd cat will have a little better
> result than the headers.
> As of right now, nobody will touch the Y-pipe! I'm going to take care of
> the third cat myself.
> See ya Sat.
>
> Matt Y2K-HEMI
> '00 RC 4.7L 5spd 3.92 4x2
> 14.23 @ 94.49
>
>
>
> In a message dated 3/10/01 8:41:05 AM Eastern Standard Time,
> Signman615@cs.com writes:
>
> > Subj: DML: 4.7 Borla Headers; Big Disappointment
> > Date: 3/10/01 8:41:05 AM Eastern Standard Time
> > From: Signman615@cs.com
> > Sender: owner-dakota-truck@BUFFNET.NET
> > Reply-to: <A HREF="mailto:dakota-truck@buffnet.net">
> dakota-truck@buffnet.net</A>
> > To: dakota-truck@buffnet.net
> >
> > Got my headers installed yesterday and the exhaust shop had a tough
time
> > getting them to work. The place where the header meets the Y-pipe was
way
> > off
> > and the only way they could make it work was to cut the Y-pipe and add
a
> 4"
> > piece to spread the Y apart more. They called me before doing this and
I
> saw
> >
> > exactly what he was talking about. I was too far in to back out so told
> him
> > to go ahead. Apparently the driver's side is easy to get to but the
> > passenger's side is really tight, he had a time getting that one in. My
> > exhaust guy has been doing this sort of thing for 20 years and knows
his
> > stuff. He has two drag cars he races and works on himself so I trust
him
> > completely. He was not impressed with the design or quality of the
Borla's
> > and said the factory manifold looked like it would flow better, but
like I
> > said I was in to far to turn back now and I was looking forward to
having
> > the
> > truck sound a lot louder. I already new my HP gains were going to be
> minimal
> >
> > but wanted the sound more than anything and any HP gains would just be
a
> > plus. Anyway after cutting the Y-pipe and 4 hours of aggravation they
are
> > installed and aren't leaking. Unfortunately the truck sounds exactly
the
> > same. No difference in sound at all. I couldn't believe it. Now the
truck
> > sounds exactly the same as before, probably has the same HP as before,
and
> > has a cut Y-pipe that is no longer under warranty. Live and learn. This
is
> > not an upgrade I would recommend to anyone with the 4.7. My exhaust man
> said
> >
> > he was highly impressed with the factory manifolds. I should have
listened
> > to
> > Kenne Bell when they told me they were only able to squeeze out another
> > 7-10Hp at the rear wheels with their $700 set of headers and didn't
> > recommend
> > doing the upgrade unless I was racing and just needed that extra little
> HP.
> > But I was hoping for a better, louder, more aggressive sound more than
> > anything and got nothing. Sorry this is so long just thought I might
save
> > you
> > all a little aggravation, time, and most importantly money. Spend it
> > somewhere else.
> >
> > Paul
> > 00 4x4 CC 4.7 Kenne Bell Supercharged
>
> >
>
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