Need to replace air ducts on my dakota. These do what they say or are they just purdy?

http://en.wikipedia.org/wiki/Cold_air_intake

What ya say guys?

Ride safe, Keep sharp

Tj

They do give a small amount of horse power increase and maybe some increase in mpg if they are designed SPECIFICALLY for your vehicle.  They usually look pretty cool.  You will probably hear your intake sound now when you accelerate.  Some installs are easy, some are hard.  For every day street use you're probably just throwing money away for the amount you gain.  However, you said you need to replace your air ducts so that would be money off the price of a kit.  In other words, how much more would it cost or is it even cheaper to get a kit.  I think I would stick with the kit from K&N if available.

Make sure they are not eliminating the "hot" air intake if your vehicle has one.  This would be an intake hose that runs to the exhaust manifold to get hot air to assist in engine warm ups and cold weather driving.

What year Dak? My 92 doesn't have a manifold heated tube on it.
It already has a cold air intake on it from the factory.  It just isn't as large as anaftermarket unit and most of them aren't really a CAI. About the only diff is the relocation of the filter from the top of the throttle body to the end of the tube. The reason you can hear the intake better? It isn't taking in air from outside the engine compartment.
Go to the junk yard and get replacement parts for a fraction of the cost.

My 91 (V8) does.

Yep, just took a gander at the shop manual. 91 and earlier has it.