Has anyone used a J Wolf Pop Charger available from Courtesy Nissan. . .and if so were there any performance or gas mileage gains. In anyone's opinion, would if void any engine warranties?

I've used JWT in the past and known people that have used products from them and no one ahs ever complained...JWT is a decent company that supports the Nissan community...

But as far as voiding the warranty yes it would..But they'd have to prove that the intake caused the problem...For example if your brakes let go then they can't say it's the intake now if your engine becomes hydrolocked then they could say the intake did it....

I have one. No complaints with it. Gas mileage improved m-a-y-b-e 1 mpg. Hard to tell with my BFG A/T though. I get between 16-18 mpg on a regular basis.

Stone