don't know anyone who wouldn't like a little more performance out
of their vehicle. Whether it's a brand new Jeep TJ, a beat-to-death
FJ-40, or a screamin' new Mustang, we all thirst for just a little
more oomph out of our motors. Once we stick those giant tires
on our rigs, we can almost watch the gas gauges move on their own
and watch everyone else fly by on the road. And what about on the
trails? When you need to get some horsies to the ground in a hurry
to get over an obstacle, you want power and you want it now.
Of course there
are dozens of ways to get better performance out of our rigs, including
free-flowing exhaust, better gearing, throttle body modifications,
headers, and many more. One company that's been helping racers perform
better for years is K&N. K&N makes stock replacement air
filters for many vehicles that directly replace your OEM filter.
These filters add some power and do typically give some noticeable
But us four
wheelers are a different breed. Everything we want has got to be
better, bigger, bolder! When the Jeep TJ came out in '96 ('97 model
year), I got one early on. By the end of '98, the Project TJ was
beginning to be built up and with 32" tires was already feeling
anaemic. At the time, K&N was not yet making a direct replacement
filter for TJ's and the one for YJ's, though similar, did not fit
in the TJ's air box without trimming.
Our own K&N modification.
to my fellow TJ'ers I decided to do my own modification to fit a
cylindrical air filter on the cut-down stock air tube of the 4.0L
motor. In January of 1999, we ran a brief
story telling how exactly to do this modification on the 4.0L
and also the 2.5L Jeep motors. This mod. has proven very popular
among the TJ ranks and we get a ton of people asking about this
setup every month. One thing to keep in mind with this setup is
that it can void the warranty on some motor parts and may not be
legal in your state.
at the SEMA Show in Las Vegas, K&N rather quietly introduced
their new Fuel Injection Performance Kit or "FIPK" for
the Jeep TJ six cylinder motors. I was very curious and excited
and had one sent out for us to try out on our Project TJ as soon
as they were available.
So what's the
scoop on the FIPK? In the case of the TJ, it is considered a Generation
II kit, which means that it consists of not only the air filter,
but also a new air tube (intake tract), heat shield (baffle), and
everything else you need to get going.
FIPK for the TJ is claimed to increase airflow to the throttle body
by up to 26%. K&N also states that the FIPK kit is 50 state
emissions legal and is also CARB (California Air Resources Board)
approved and the kit will not void your vehicle's warranty.
K&N backs the kits with a 10 year, million mile limited warranty,
The FIPK straightens air-flow and also increases the amount
of air being pulled into the throttle body.
OK, so there
are all the claims, but how's the FIPK really work? Here's the scoop.
To quote K&N,
K&N Fuel Injection Performance Kit (FIPK) dramatically reduces
intake restriction as it smoothes and straightens air flow. This
allows your vehicle's engine to inhale a larger volume of air
than the OEM air filter assembly. More air means more usable power
and torque throughout the engine's RPM range, with even greater
power gains in turbocharged and supercharged engines. "
So there you
have it. Straighter line of air-flow, less restriction, and more
volume of air give you more of that oomph we were looking
I've been running
the FIPK (part # 57-1514) in our Project TJ now for a few months.
One of the hardest things for me to do before writing this article
was to determine if this thing really works and if it does work,
how much better does it work than my own, previous, mod.? This has
been a difficult task without having access to a dyno or other testing
equipment. So right here and now I will make my statement and disclaimer,
if you will:
as to the performance of this K&N FIPK kit are made solely
on my seat-of-pants feelings and I offer no scientific proof,
What I will
say, though, is I have a fairly good seat-of-pants to make my claims
by and have full confidence in my seat-of-pants!
Now before I
make my statements, let's take a look at the FIPK and how it all
installs. You will need a minimum of tools and about an hour or
less to do the installation.
page | Installation | Conclusion