I have the 4.7L v8 in my truck, I put the drop in K&N air filter on my
truck. I also installed the Airaid TB spacer as well on the same day.
When you install these two products together, you can definitely feel
the difference in acceleration, a lot quicker. My question is, what
else can I do to get more power out of the truck and make it quicker,
without voiding the factory warranty. I know there is the Jet
Performance chip, anyone ever used this? My dodge dealer said I could
install the chip without voiding the warranty, the only draw back is
not knowing what kind of power I would get out of it and also having to
use mid-grade gasoline. Also Gibson headers, the make a set to fit the
4.7L for my truck. Performance gains claim to be 15-20 HP, 26 FT
LB/TQ. Has anyone installed the Gibson headers on the 4.7L? I read
that installing headers on a vehicle will not void any factory warranty
according to different websites, but I'm not sure. Thanks for any
The "problem" with new vehicles is that the factory engineers are pretty
and have already done the easy stuff. 20-30 years ago, it was pretty easy to
dramatic improvements in vehicle performance with a few simple changes. Not so
The improved air intake/filter is a good first step. The factory doesn't do
because they also have to meet noise restrictions. You may have noticed that
new air intake is noisier than stock.
The throttle body spacer is probably a waste of money. Try removing it and
if you notice the difference.
Reprogramming the computer should be your next step. That really is the
bang for the buck. I used Hypertech, but I've heard a lot of good things about
as well. Do this before doing anything else.
Headers will make almost no improvement below about 4,000 rpm's. The
exhaust is quite good. Personally, I wouldn't do it. Lots of expense, pain in
behind, and very little improvement. Same with a cat back system. Sounds
but no power increase to speak of.
If you want better pick up and towing capacity, consider changing your rear
As for the factory warranty, refer to the Moss-Magnusen warranty act.
Essentially, it says that if you make changes, you are responsible for those
But if something else fails, the warranty is still valid. For example, if you
headers and cat back exhaust (emissions legal), and you break a valve spring and
trash the motor, the warranty is still in effect for that trauma. The entire
available on line.
On 8 Jul 2006 10:01:23 -0700, firstname.lastname@example.org wrote:
The power gain for a K&N in more a state of mind than anything.The
little flow increase is obtained with less filtration as is well
documented in some ISO test on line. Modern engines are well tuned on
intake and exhaust from day one and if power gain where if fact that
easy, they would come that way. On the headers, you will loose low end
torque and responce and MPG in town too. If you want a real boost that
you can feel in the seat of your pants, regear the trucks axle one
step deeper. You lack displacement to make any serious torque but
deeper gears can bring it to life and let you better use the power you
have and contray to popular belif it will not hurt MPG with OD tranny
and city MPG will likely improve because you will get off of power
wasting stall of torque converter sooner.
On Sat, 08 Jul 2006 19:07:38 GMT, email@example.com wrote:
I lace K& N filter in there with snake oil. People want to believe
there is a silver bullet here and K&N plays on it. Check out link
below. It is on a Dmax but it show what a K&N does in a high demand
As far as the warranty goes: If the modification causes a failure, then the
warranty does not cover it. Dealerships can find ways to say that a
modification voids the warranty. Especially with an aftermarket computer
chip. If you want my opnion, I would leave the truck alone; and buy an old
beater truck to rebuild and modify. You will have no warranty worries.
There will be more parts available, and for a cheaper price. If your truck
is your daily driver, then you won't have to worry about be stranded or
running out of time. Another thing is that older vehicles can for the most
part be more simple to modify. The thing I don't like about modern
vehicles, is that it seems I can't fit my hands into some places. Sometimes
to get to things, you have to take apart too many things to get to what you
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