Plugs make a car. Anyone with a DD turbo car will agree with that. New plugs will make a car feel good as new. Spark plugs are a MAJOR part of the combustion process.

Ive witnessed some high dollar race teams come in and do some pretty crazy things when it comes to the spark plugs in their vehicles. You would be suprised with the amount of time that can be spent on plugs being primary focus. I was

From filing/sharpening the electrode, clocking the plug in different degrees, multiple grounding straps, additional washers for spacing, different gapping techniques, etc.

MANY lower end race teams also spend time testing shelf plugs and different oil brands/weights etc. you would be suprised at which style/brand plugs yeilded gains.

NGK is what i would reccomend.