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While purists will argue that
some of these changes seriously hampered the car's HP capacity
when upgraded, we have developed components that have allowed our
customers to achieve 11 second quarter mile, very streetable cars
with engines that are otherwise completely stock from the throttle
body to the oil pan!
Like the 89-94 (1G) models, the
stock engine is capable of double the stock HP if provided with
the correct components to enhance its airflow. The keys to
successful upgrades are still:
1. Complementary, well matched
changes that work well together.
2. Adding the
correct fuel system improvements to accompany the airflow
increases that are achieved by upgrade parts.
| 1.
Start with a K&N Filter Airbox Replacement. This
unit will allow mega airflow for minimal investment, and
is all the air filter you will ever need. Replacing
the bulky, restrictive stock airbox with this quality
filter also enables additional room for the intercooler
pipe upgrades that come later.
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| 2.
Next is an exhaust system. Our 3" Stainless
Steel Cat Back systems provide excellent performance,
looks, and sound, and are immune to rust-through.
You will have enough flow for the future, too, as these
units can readily support 500 HP!
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| 3.
Intercooler pipe and blow-off (compressor bypass) upgrades
come next. The stock blow-off will not allow boost
pressure increases, so it's gotta go! We replace it
with either a GReddy Type S, or a stock valve from the 1G
car. Bolt the new valve to our Stage I Intercooler
Pipe Upgrade, or replace all of the intercooler pipes /
hoses with our Stage I/II pipe set (also available
separately).
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| 4.
A boost controller will allow higher HP with the stock
turbo. Be sure to replace that blow-off valve
first! We use the GReddy Profec B controller, and
have found it to be the best value in terms of consistency
and features, and we have tested them all! Manual
boost controllers are available from other vendors, but we
do not sell them as the lower price is offset by their
inconsistency and need for frequent re-adjustment due to
weather changes.
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| 5.
Along with the Boost Controller, we recommend a Boost
Gauge and Windshield Pillar Mounting Pod. The stock
boost gauge in your car is primarily there to entertain
you, and is not accurate enough to depend upon when
modifying the car for higher power levels. Our
Autometer 30 PSI boost gauge is accurate, also shows
vacuum, and installs easily with the pillar-mounting pod
we supply.
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| 6.
A Fuel Pump Upgrade is next. The pumps we offer are
bulletproof dependable, and install in place of the stock
pump. These pumps will support up to 425 HP.
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| 7.
The stock turbo is limited to about 270 HP maximum, a mere
60 HP more than stock! If your future needs will not
exceed about 350 HP, use our basic Mitsubishi 16G upgrade
with installation kit. Since your car came stock
with a Garrett T-25 turbo, the installation kit is
required to install the basic Mitsubishi 16G: it contains
all of the required components to install the turbo, such
as gaskets, seals, oil lines, etc.
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| 8.
You say you want more than 350 HP? No problem:
choose our Super 16G upgrade. This exciting new
design will allow up to 400 HP, and can be easily
converted later to Super 20G specs for up to 500 HP!
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| 9.
With the bigger turbo, further improvements can be seen in
upgrades to the downpipe and catalytic converter.
Our original Eliminator Downpipe works great with stock
turbos and basic 16G upgrades, and prevents you from
needing to port out the restrictive stock O2 housing by
replacing it. If you are keeping the stock O2
housing, or using our Super 16G or Super 20G upgrade,
choose our Eliminator Jr. Both of these excellent
units can be combined with our 3" MaxFlow catalytic
converter. The 3" Max Flow also interchanges
with our Off-Road Pipe for easy switching back and forth
for competition and street use (Off-Road pipes not legal
for street use in any state).
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| 10.
No matter which turbo you choose, you will also need to
port your exhaust manifold to accommodate the larger
unit. If your manifold is cracked internally (many
are), our CNC Ported Cast Steel Manifolds are the way to
go. This already-ported part will also make your
turbo installation easier.
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| 11.
Still need more? No problem! The next move is
to upgrade the fuel system again. Add our 625CC
injectors and an Apexi Digital Super AFC. Not only
will this provide the fuel flow you need to safely support
the HP you crave, it is also an affordable way to push
that pesky factory fuel cut to higher boost pressure
numbers.
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| 12.
And if you just need to go for it, the Super 20G Turbo
Upgrade is the last word in modern Mitsubishi bolt-on
performance. This is the first-ever 20G for DSM that
does not require an expensive External Wastegate
system.The above guide is the most effective approach to
quality high performance we have achieved in years of
testing with street / strip driven Diamond Stars.
While complete, it is intended as an overview. If
you are attempting to make a 400+ HP machine, be sure to
consult with one of our salespeople for advice about the
finer points of bringing it all together!
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*Some
products listed are legal for sale or use in CA only for
racing vehicles which may never be driven on a public highway.
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