Has it had the hi/lo solenoid bypassed? I'd double check if I were you, the guy I brought mine off sold it cheap because he couldn't figure out why it was fuel cutting lol What's the spec?
The supra could do it because effectively 3 of the Supras cylinders offer more displacement than all 4 of the 4EFTE. Über lag. As I said earlier, compound charging would be pretty cool but a lot of effort.
What have you seen for sale or stuck to someone's motor that's either über or utter shite? Much want: http://item.mobileweb.ebay.co.uk/viewitem?itemId=220578397088&index=0&nav=SEARCH&nid=43728734799