Article by: Lee50guru
You see the stang that steals
your heart. After laying down the cash, you drive her home. At a red light
along the way, a fellow stanger pulls up next to you and revs. The deep
roar coming from his tailpipes is felt deep in your chest. You nod and
rev your steed to achieve a "Purrrr". He snickers and you both
drive off, but you have a mission now. To make your stang growl to let
the world know what kind of beast it is.
According to the recent Mustang
poll, more than 1/2 of voters would or did spend their first modification
dollars or exhaust. Easy decision on what to do, but the real decision
lies in whose exhaust to buy. With more than a dozen companies making
cat-back systems alone for Mustangs, the trying to figure out how it will
work with your combination can be overwhelming. Don't fret we're here
We obtained 10 different after-cat exhaust configurations for 1987-1993
Mustangs (1979-1986 can use the same setups if converted to true dual
exhaust). The goal is to illustrate key points of each system and explain
how it worked on the test car to help you make an informed decision on
what system might be best for you.
The test car is a mildly modified 1990 LX 5L (details here). The rest
of the exhaust for the testing was comprised of MAC 1 5/8" EL headers
into a Bassani 2.5" offroad X-pipe. Weights were included where possible.
OK, now let's get started.
This may have kept the bean counters
happy, but it left almost everyone else wanting more. The stock 2 1/4"
pipe fit well, and it's brushed stainless tailpipes while small, did add
style to the side view. Mufflers were different sizes side to side to
minimize drone at 2000rpm. Sound quality is livable until another stang
with a worked exhaust pulls up next to you.
STOCK WITH DYNOMAX SUPER TURBO MUFFLERS
Next we welded a set
of Dynomax 2 1/4" super turbo mufflers. Fit and looks stayed
the same, but the sound really woke up. Drone at 2K was woken also.
At 70mph cruise this setup was almost unbearable. Power felt up slightly
2.5" FLOWPATH SYSTEM
This system is impressive
at first glance. 2.5" diameter throughout. The tailpipes are triple
chromed and look nice. The muffler sections are HTS coated. This coating
keeps the pipes in good condition. The system I tested had survived a
Michigan winter, the muffler sections looked almost new. The chroming
of the tailpipes though was another story entirely. Even with constant
care by a VERY meticulous owner, the pipes rusted severely. In a milder
climate this I'm sure, would not be the case. Other features of the system
include flanged ball and socket type tailpipe to muffler section connections.
I was pleased with the ease with which it went together. Fit of the system
as a whole was excellent, Mac uses the term "TRUE FIT" for a
reason. One slight problem was with the muffler hanger installed, the
mufflers hit occasionally on the floor pan. After hearing from other Mac
system owners on the same problem, I decided it best to remove the front
hangar and the problem was solved. Another SERIOUS problem I had with
the system was that the flanged connection to the tailpipe is welded and
on the system I had, the connecting flange was clocked incorrectly. This
caused the flange to crush the rear hard line to the left rear brakes,
causing the test car to slide off of the road while braking from about
50mph. The test car and I both came out of it unscathed, bitter, but unscathed.
Any competent muffler shop can cut this and rotate it to the proper orientation,
but I realized the problem after the fact. Something to keep your eye
out for when installing. The sound of the Mac system is distinct. The
sound is deeper than a Flowmaster system with the same sound quality.
I think if I heard another Mustang with an offroad H-pipe and Flowmaster's
on it I'd lose my lunch. It was nice to hear how different it was. Power
was good in mid to high end, but felt slightly down off idle. System weight
= 42#. The pictures are after one Michigan winter.
AMERICAN THUNDER ( 2 chamber ) SYSTEM
This system, for as widely as it's used
really had my expectations up. The system is aluminized steel and corrodes
rapidly. I would expect this system here in Michigan to last 3 years tops!
If your car is just a racer, the good news is it flows very well. If you
enjoy driving your car though, be wary. Drone was the worst of any system
tested. Fit was good with only slight adjustment necessary to keep it
away from the 245/45/17's in the rear. This system with a stainless steel
tailpipe upgrade is the way to go if you have to have flowmaster's. Power
felt nearly identical to the Mac system.
87-93 LX 2" SYSTEM
As soon as I opened the box the
quality of this system almost smacked me in the face! The system is 100%
stainless steel with polished tailpipes that you could shave in. One thing
that concerned me at first was the small pipe size, but after speaking
with the Borla engineers, I decided to stay open minded until it hit the
strip. The system fit VERY well as I figured it would, given its' smaller
than stock size. Sound was a welcome change coming right after the Flowmaster
system. The engine sounded more similar to a 4.6L Cobra than to the 302
with Flowmaster's the car was earlier in the day! Power was up of idle
and still felt powerful throughout the whole tachometer range. I was skeptical
of what the times would be at the strip with this small system on. I was
shocked. On the street this was a great system as it kept the car quiet,
with no drone to speak of ( Borla obviously did their homework ). The
tailpipes flair up slightly to a polished square intercooled tip. Only
qualm I had with the system as a whole was the lack of a manly tip. From
the side it isn't too bad, but from the rear it wasn't the look I was
going for. Judge for yourself. My second mishap happened with this system.
During an overzealous testing session, I was torqing the car up in a parking
lot. I run Lakewood strut and shocks and have great weight transfer. As
a result of this, when the car came down on the suspension as I came off
of the throttle, the mufflers kissed a speed bump. One was only scraped
and the other is no longer with us! Scratch one beautiful exhaust system.
System weight = believed to be 33#
WARLOCK 2.5" SYSTEM
This system is aluminized steel
with painted muffler which look good and the paint will help stave off
corrosion. Fit was good, but the mufflers hung a tad too low. The tailpipes
have a welded on polished stainless tip, so they'll look good almost forever.
The sound was very unique, incredibly deep sounding. The sound was similar
to a 351 with Flowmasters. The mufflers also have a very cool feature
for the street/strip crowd. Each muffler has a cap held on by 3 wing bolts.
Once the cap is removed the muffler flows straight through with no restriction.
What this would add at the track was still to be seen though. A fellow
stanger I know lives in northern Michigan and runs this system with a
stock H-pipe. He keeps the caps off at all times until he comes down to
the Detroit area. Sounds great like that.
2.25" 93 COBRA SYSTEM
This is a great system! I found
this to be probably the best all around system I tested. The piping is
a ll 2.25" and the tailpipes flair out to 3.5" round slash cut
polished behemoths. The Cobra system fits on all 87-93 LX 5Ls and 93 Cobras.
Sound is identical to the Borla 2" system but kicked up a few decibels.
More like the exhaust note of a supercharged 4.6L Cobra Very smooth and
powerful. No drone, not obnoxious on the street and power felt up all
through the car's range. The track result showed the car was as pleased
with this setup as I was. I experienced a slight tire rub problem that
it took a few minor readjustments of the pipes to fix. If you're installing
this system be aware of this. This was the all out "WINNER!"
if there really was just one of the whole test. Power felt the highest,
it had the broadest feeling power curve, and it's track times were #2
overall. System weight = 34.5#
2.5" XR-1 94-95 COBRA SYSTEM
The first two Borla systems used the same
mufflers, and these were the only systems available for 87-93 Mustangs
from Borla. 94 and newer Cobras all use XR-1 race mufflers, but this wasn't
and option for the old fox bodies. Borla found that the 94 & up system
should fit on a fox. I was the first to try this out. The system's fit
was very tight in a few spots, namely the muffler to frame rail clearance
on both sides, but it comes with adjustable pipes from the H-pipe to the
mufflers so there is some room to work. Any competent muffler shop can
tweak this system around in about 20 minutes to make it work out just
fine.This has the same 3.5" polished flair tips that the 2.25"
system has. This wins my "Best Looking From the Rear" award.
That's all most people see anyway, right? This system also wins two other
very prestigious exhaust awards. One being the highly envied "Fastest
Times" for allowing the car to breathe enough to score the best 1/4
mile times. Second was the "Best Sound" award. This system is
so mean that one of two things will happen, you will either drive around
town in second to show off and get arrested, or sit in your driveway revving
just to hear the sound of the exhaust and...well...get arrested. System
weight = 37# The second pic is of the adjustable section of the system.
2.5" QUIET THUNDER SYSTEM
This system is 2.5"
stainless steel through out with 3" polished tailpipes. The quality
of the welds on the mufflers was top notch. The system was almost a ringer
for "Best Sound" awards, as it was tested with Bassani's own
X-pipe. Sound is deep, throaty, and powerful in a way that can almost
not be defined. The tailpipes grow to 3" just barely behind the tire
to maximize tire clearance and give the meanest looking view from the
side of the whole bunch. The tailpipes come with a resonator insert that
eliminates drone at 2K RPM. At about 200 miles into the road testing,
the small fastener that holds one of them in vibrated out and became the
world's most annoying rattle. They were removed soon after. Without the
resonators, sound quality is much better, picking up a few decibels, although
drone is raised significantly and is very powerful at 1950-2000 RPM. Another
thing to note is that fit of the mufflers to the frame rail ( mostly on
the right side ) is VERY tight, and the pipe over the axle liked to ride
on the sway bar almost as much as it enjoyed riding ever so closely to
the fuel tank heat shielding. This system is very high quality, but like
the Borla 2.5" system expect to make a visit to the local custom
exhaust shop to get the bugs out. Once tweaked, this will give you limitless
years of a wicked sounding mustang! System weight = 42# with resonators,
40# without. This kit also comes with new hardware for the flange to the
I-pipe and anti-seize, which I thought was nice.
GAS / SPIN TECH
This is actually only a set of mufflers
versus a complete cat-back system, so they were plumbed in a Flowmaster
2.5" system for testing. The Mufflers are designed using flow characteristics
of exhaust to dampen the sound instead of fiberglass like many others.
It is a straight through flowing muffler and I was excited as to what
it offer by way of performance and sound. I've always liked the Dr. Gas
X-pipes and this looked to be of the same school of thinking.
This is not meant
to be all encompassing, but a guide to help you make the right choice
for your mustang. Please keep in mind that all systems may sound quite
different on your vehicle as your exhaust system and engine modifications
are not the same as mine. Also, while the snowy, salty road daily driver
should probably look toward one of the stainless systems, race only stangs
and those of you lucky enough to live in more moderate climates need not
consider this a requirement. All systems involved had a good showing and
did better sound quality (if not horsepower also) significantly over the
stock setup. Please contact the company you are interested in to speak
with their technical staff to determine what is best for your combination