I bought this for my newly-acquired 2017 Honda Civic Si coupe. I mean, it's a turbocharged engine, and should sound like one, right? The instructions provided were not good at all, nor was the installation video on Injen's website. You do NOT have to take off the front bumper but some disassembly is required. Once installed, the sound it produces is sweet, mechanical music. The hiss of the turbo as well as the recirculating valve sounds awesome! Well worth the effort to install!
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!!