The theory is night and day, when i was tuning C20LET calibra turbo engine we used to use the C20XE NA cam shaft the stock and kept the exhaust cam stock, we spent around a year dialing in the cams on adjustable pulleys, and found a sweet over lap which gace 35lbft in the midrange and around 18bhp on the peak power on my T3.
I tried a NA cam on my AUm but had starting issues, I needed to fit piper pulley and set it up correct, but never had time to do it.
My current big turbo setup will be using a AGU with out the AUM VVT fitted and using a NA inlet dialed in on a vernier. I will let you know my results around March time.
I might pop the NA cam in TingTongs stage1 AGU next weet and dyno back to back...
