I got a set of NGK Iridium plugs (1 step colder) and Magnecor wires from NeedsWings 2 weeks ago for $235 shipped.

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My mileage was steadily decreasing and power was noticeably down - put the new plugs and wires and the difference was amazing. MUCH more power and my mileage has immediately gone up over 4 mpg, even with the 'playing around' I've been doing with all that extra get up and go! I didn't see anything wrong with the plugs or wires, but there must have been some problem...

It was not hard at all to change them - took me about 1.5 hours at a leisurely pace. All I needed was a 5/8" deep well socket, 6 in. extension, ratchet, T-30 torx driver, and a .039" spark plug gap wrench (per my n/a manual):

- pull the low-voltage wires from the tops of the coil packs - secured by a wire tie
- there is a vacuum line on the driver's side that needs to be disconnected
- pull the coil packs - you will need a T-30 torx
- disconnect the plug wires from the coil packs - remember the top coil pack wire goes to the front plug
- pull the wires from the plugs - pull straight out, don't twist them. Be careful on the 2 furthest back - they can be knuckle busters...
- blow the dirt/dust out of the plug holes with compressed air
- replace the plugs
- clean the metal on the back of the coil packs and the valve cover where the coil packs meet
- starting from the back, put the wires on the coil packs, then on the plugs, making sure you hear/feel the click to ensure they are completely on
- reinstall the coil packs and low-voltage wires - secure with a wire tie
- reconnect the vacuum line if you disconnected it
- repeat on the other side
- after driving around for a day, check to make sure all the wires are still seated on the plugs and the coil packs

Of the 12 plugs, 5 were gapped incorrectly out of the box, but only by a couple thousandths.