Yes, I had one installed for 3 months, shortly after I bought my Xterra in August 1999.

I also did an impromptu drag race with a friend in an identical Xterra (4X4 XE 3 pak, 5SP, 31" tires). There was no difference (0-50mph), and he had 2 people in his.

The Xterra was also prone to stalling when pulling away from a stop, due to loss of low end torque. This may be due to living at 5000 feet.

SLR has a cold air box in development, and I'm interested in intakes again now that I have an aftermarket exhaust fitted.