The KA can hold up around 350hp on stock internals and the 4G63 can hold close to 400hp on stock internals w/proper tuning...so they are close...the SR can hold around 350-400hp too (just in case you were wondering)
Only one worth while having if you want to street race is the GSX and a 1st Gen one...the 2nd gen's are too heavy and have problems w/crankwalk
Reason being...1st gen GSX is cheap to buy and cheap to mod and will go fast real quick w/lil invested