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i did it the other day actually i have 17k mile on my z, didnt get alot of smoke, but i only added it into my oil and my gas tank i didnt spray it under my plenum..i was very limited on time...car still runs great, performing to its peak...i guess i could even do a dyno test :-P but it probably would be worth it...i know this stuff works cause ive seen camaros put it in and sit there and rev there cars you wouldn't imagine how much smoke comes out of the car...its intense...i also use Redline Complete Fuel System Cleaner (for my injectors) i use that just about every month, the seafoam also removes the water that sits at the bottom of your tank...which is very good cause water collects during the winter...if u have any other questions let me know..