it jus a lil thing where u can control ur vtec to when it kicks in like most cars there vtec kicks at like 5 or so. but if u get this u can make it come on at when ever u plz.......i think im rite but if im wrong sum1 plz correct me
^ yes and no, you can adjust it to a point, but you also get control over your A/F ratio so you can adjust it along with your vtec to keep everything running correct. but like someone else said you need to properly tune it. id agree, with your mods i wouldnt worry about it.