Regarding engine swap if you want to swap then G15 engine would be your best bet.
Powerful, Economical.
Needs less alterations almost bolt on fitting in cultus chassis.!
G10b is available in market but not that much easily and is expensive...
But in engine swap it's not just slam the other engine in and you are good to go.....
Swap also needs some alterations chassis reinforcement, brakes upgrade, shock, springs, etc,etc......
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