http://rover.ebay.com/rover/1/711-6294-2978-0/1?PID=2172837&AID=10381315&SID=1994%20Dodge%20Stea lth&loc=http%3A%2F%2Fcgi.ebay.com%2Fws%2FeBayISAPI .dll%3FViewItem%26item%3D360031003578%09

That was on ebay and I was wondering if anyone knows if I can or should trust these guys or if I am just getting ripped off?

Snake oil...

Don't do it! Possibly one of the biggest scams on Ebay. Adds 60HP and 20MPG?? For $9?? Like the old addage says, if it sounds too good to be true... it probably is.

Oh, and check out all the neutral and negative feedback for that seller... Lots of positive feedback on the fast shipping.

Could you suggest a chip for me then? I am mainly looking to get better gas milage, but if not more horsepower would be nice :)

There are no "chips" for these cars.

So is there anything like that which would improve my gas milage?

If you're looking to improve gas mileage, a 3000GT or Stealth probably isn't the car for you. The SOHC models get better mileage than the DOHC NA and TT, but gas efficiency isn't the car's strong point. Stock it's something like 19-24 MPG. Anyone who claims that by adding some "chip" will improve your gas mileage is LYING. The only real ways to improve gas mileage are to drive more efficiently (so that means no street racing), keeping up with the regular maintenance and/or buy a fuel efficient car.

I have owned both a heavily modded Stealth and VR-4. There is no such thing as these performance chips.