Love, love, love that sound!
Installed this on a 2003 Jeep Wrangler with the 4.0L I6. Installation took about 1.5 hours; probably wouldn't have taken so long if the instructions were a little clearer. Acceleration is definitely improved, most noticeably when it's humid outside. Oh, and did I mention the sound? Once the RPMs rise to about ~2200, you can clearly hear the induction noise. That alone was worth the price of admission!!