Have you tried these?

[rynosback]

I would think it would change the timing more, but I have not seen it or tried it.

http://cgi.ebay.com/ebaymotors/ws/eBayI ... 19354&rd=1


I don't see how extending the throttle body would help, but I could be wrong.

http://cgi.ebay.com/ebaymotors/ws/eBayI ... 51792&rd=1

[JMM]

I have never tried any of the performance chips but got a bud that did and he says he is getting 2 miles a gallon more on a Dodge Hemi PU.

[rynosback]

I have never tried any of the performance chips but got a bud that did and he says he is getting 2 miles a gallon more on a Dodge Hemi PU.

Which one did he use? I have seen chips, but I think this one does not plug into the ECM.

[JMM]

Do not know - will ask him...

[ReneDave]

I could go either way on the K&N cold air intake. I've used similar setups on high performance engines and noticed a definite improvement, but the stock 2005+ KJ setup is supposed to be about as good as you can get. Heck, if you really want to see if it'll make a difference disconnect the air intake tube from the airbox on a dry day and see if it makes any difference.

The tornado is junk. It'll increase the intake noise and maybe give you an ego boost, but that's about it. You do not want to increase air turbulence in a fuel injected engine!

There are performance increases to be had by modifying the throttle body then swapping out the exhaust for a Borla or Mopar (same thing, and Mopar actually sells it cheaper) dual exhaust. You may (as in probably) lose some low end torque going this route, and you'll end up with worse mileage, but you'll improve acceleration.

[TJTank]

. . . if you take the airbox off, it will sound like you have a turbo . . . .

sorry somebody had to say it

[JMM]

I could go either way on the K&N cold air intake. I've used similar setups on high performance engines...

As I understand it you can even get a mile or two by just swapping to a K&N replacement filter for the stock air filter without going the whold cold air intake system. In fact I have seen where folks go back to the stock air box from the cold air system due to the exposed filter.

[Jonny]

those are mostly snake oil. Some people swear that the throttle body spacer helps, others say its a load of crap. either way, its a jeep. it doesnt get good mileage.

[rynosback]

I was not expecting the same millage that this Lib replaced. I had a Toyota Corolla, millage was in the low 30's.

[MPETE]

I dont know if they do it for mopar computers
but I know in the GM world there is a company called PCMs4less or something like that
and you send them your PCM and they reprogram it
you can specify certain parameters you want removed if you know of specific oneslike disabling the rear O2 sensor or reducing/removing torque management when the trans shifts
or if you just want a basic performance tune or a basic MPG increase tune they can do this too

there are a couple guys on the S10 boards I am a member of who have sent out trailblazer V8 or silverado V8 PCMs out to be tuned and all they have to say is positive things
both of them got better mpg AND better power numbers after the tune was done
I dunno which direction they were goin as far as what tuning they wanted or if they just got a generic "tune" done

maybe give them a shout and see if they can help you out

[rynosback]

But in MD with the emissions testing I would think they would catch that and fail you. Might even fine you as well. They don't tail sniff new cars. They just hook up to the OB connector and see how she is running.

[MPETE]

you can have it tunued and as long as there is no check engine light you pass
they dont look at the actual parameters or anything
they just hook up the computer and let u go
I would be willing to bet they wouldnt even know
especially if its a more economic tune which probably leaned out the mixture a bit which should redue the emissions further