Love what this Jenson mod 70 did for my tone. Way tighter lows. The lows on the stock 12" crapped out at higher db's. Also sweeter highs imho. I have been running
Let's Talk Celestion... Is It worth Upgrading the Speaker on Your BOSS Katana? - YouTube
Boss Katana Speaker comparison - YouTube
Boss Katana Head COSM Head with Internal speaker + Boss Katana 212 150 Watt Cabinet