I installed these spark plugs on my 2005 Nissan 350Z and they worked wonders. I saw an average increase of 4 hp. on wheels and an increase of 2-6 mpg. Thanks to the pre-approval, it simplified the installation. Still long but easy. I've been using them and riding daily for about 5 weeks and I'm not getting any engine codes or seeing any lack of power. They're perfect if you're looking for a little HP boost at a great price.
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