VQ37 header install worth it?

I installed headers on my G37 But I got a misfire right after which happened probably because I didn't disconnect the battery. The installation applies the same to 370z's. Oh and guys check out Lukas Lenner's channel it's awesome and very helpful. He helped me with a ton of tips while I worked on mine.    / lukaslenner   Music credit: Track: Dark Heart - Crash Test Dummy [NCS Release] Music provided by NoCopyrightSounds. Watch:    • Dark Heart - Crash Test Dummy | Electronic...   Free Download / Stream: http://ncs.io/CTD - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Track: Jim Yosef x ROY KNOX - Sun Goes Down [NCS Release] Music provided by NoCopyrightSounds. Watch:    • Jim Yosef x ROY KNOX - Sun Goes Down | Mel...   Free Download / Stream: http://ncs.io/SunGoesDown - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Track: Aeden & Joellé - I Feel Crazy [NCS Release] Music provided by NoCopyrightSounds. Watch:    • Aeden & Joellé - I Feel Crazy | Future Hou...   Free Download / Stream: http://ncs.io/IFeelCrazy - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Track: Dirty Palm - To The Back (feat. Purple Velvet Curtains)[NCS Release] Music provided by NoCopyrightSounds. Watch:    • Dirty Palm - To The Back (feat. Purple Vel...   Free Download / Stream: http://ncs.io/ToTheBack - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Song Nekozilla Artist Different Heaven Licensed to YouTube by AEI (on behalf of NCS); CMRRA, ASCAP, BMI - Broadcast Music Inc., Featherstone Music (publishing), LatinAutor, and 8 Music Rights Societies