I just found a real nice '94 Crown Vic with the 4.6L SOC engine. The
has single exhaust and I would like to upgrade it to duals.
Does the single exhaust system use dual catalitics, in which case
I can cut the Y pipe and have duals custom made (stainless)?
Any idea what the largest pipe can be use to fabricate the pipes?
It's a Canadian vehicle, whether that makes any difference.
I would imagine that they use two separate cats. My 1983 grand marquis had
two, and then they combined to one pipe, and we made it into dual exhaust.
You could surly crawl under it and check.
You said it's a Canadian vehciles.... do you live in Canada? I don't know
what kind of emission laws they have... would they let you cut the cats off?
I'd think not, but I don't know for sure.
Factory H-pipe & dual exhaust will bolt right up to the converters - no
emissions penalty - will take you from 190hp to 210hp... Check here too:
All the parts for your system are pictured here... just follow the
prompts for dual exhaust. If you want to see the differences, follow
the prompts for single exhaust.
On Thu, 13 May 2004 02:37:06 GMT, firstname.lastname@example.org wrote:
It is equiped with a cat on each side. The pipes to the
muffler is connected by a pair of bolted flanges behind the
cats. To make it emissions legal duals (some locals permit
no exhaust modification), there are a couple of approaches.
The simplest is to have a shop unbolt the left side and cut
the connector going to the right side and cap the stub.
Then, you can have a left side exhaust custom made with a
muffler similar to the factory unit or install a pair of
your chioce. Re-connecting the stub to the new left side as
a crossover pipe will give it a bit more torque on the
bottom end which the 4.6 can use. The best way is factory
bolt-on. You can buy the factory replacement "H" pipe and
the left side muffler and tailpipe along with the hangers.
The only hangup here is disassembling the left side muffler
from the pipe so that it can be re-used. Many shops can
custom build a dual exhaust setup with good sounding
mufflers at a reasonable price leaving the factory cats in
place and emissions legal. My personal choice would be to
use the factory "H" pipe and have a shop build it from there
back so that the crossover would be in the correct place to
best help the engine on the torque side of performance. A
shop couls also make the "H" pipe if they know the correct
location of the crossover. Keep in mind the crossover is
not a mandatory feature unless you are looking to get the
performace improvement of the factory duals.
Thanks for all the replies guys!
I called my local Mufflerman here in Kitchener, Ontario and found that
they have all the parts needed to change it from single to dual in
Not a bad price either. With all taxes and labour, a total of $430 CAN
which works out to about $300 US :) It includes a new H pipe, one
new muffer, and 1 tail pipe.
The only worry I have, is that the little 4.6 has 230K Km, or about
150K miles on it. It has had regular maintenence and the receipts
to prove it. It passed emissions back in November 2003.
Should I worry about the high mileage? The tranny shifts very well
and the engine will easily outpull my '88 Crown Vic (302).
On Fri, 14 May 2004 11:27:54 GMT, email@example.com wrote:
The major concern in that vintage 4.6L is it's tendency to
high oil consumption because of failed valve guide seals.
This is an expensive repair on the 4.6 if done by a dealer.
I did my own after buying the special tool required to do
the job. Other tools are common in the tool boxes of well
equipped DIY'rs. If yours does not have the oil consumption
problem by now, I would not worry about it. The 4.6L is an
extremely reliable and long life engine with reasonable
maintenance. Even after the valve seals fail, it will
continue as if nothing is wrong for 10's (maybe 100's) of
thousands of miles without problems.
Another little elusive PITA problem is what usually starts
as an intermittent no-start problem. They have a tendency
to setup corrosion in the switch connection to the starter
solenoid. The fix is to clean and tighten the connection
and apply a good electrical anti corrosion paste. There is
also a service bulletin on this which gives instructions and
part number to install an improved connector.
As far as the chassis is concerned, you can expect that the
lower ball joints are likely in need of replacement if you
haven't already. It will not give the typical symptoms of
funky driving characteristics like most vehicles until they
are way too worn for safe operation.
Thanks for the great service report Mr Lugnut! I will be
purchasing the car in the next week or so. It is replacing
my '88 CV, which has served me very very well.
I will occasionally be pulling a 24 foot travel trailer, so will
have to look into getting a tranny cooler and Class 3 hitch.
Should be fun pulling that trailer with 270 ci engine!!
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