In this video, I attempt to answer the question, "If you could just purchase one, which is better, the air intake, or an exhaust?" with a series of speed runs and analyzation of the results. To purchase one the test subjects click here:
Chimera Air intake (2014-2020 grom): https://amzn.to/2V437xh
Zoom non-looped exhaust (2014-2020 grom): https://amzn.to/3rwZ4po
Also pictured, the Yoshimura Exhaust I run on my grom: https://amzn.to/2V7dRLj
Note: this fits 2017-2020 grom, for fitment to 2014-2015, you'll need this extra part: https://tstindustries.com/tst-low-mount-exhaust-bracket-honda-grom-2013-2016.html