Brandon at Batlground has got a pretty sick KA making plenty of power. I'm not sure the numbers are public knowledge but if you stop by he will talk about it. I had a 97 with a built KA a GT30R and a AEM and it made over 400hp at 18lbs through a quiet 2.5 inch exhaust. Most of that work was done at BG or by me.

I've had both a KA and a SR with over 400hp and I wouldn't even think of building another SR it cost me 3 times the amount of money to make the same power.