why would you not want to do springs.......when you increase lift you need to increase spring pressure because you have changed the resonance points of the valve....in other words you could get valve float without a higher spring constant valve spring.....
It will hurt upper RPM performance of the engine.........thats why you do springs...
If you just want a little more power get 1.8 rocker arms and leave the cam alone.
If you just want sound I'll mail you my single letter mass air meter...it reads on the low range and makes my car sound like it has a little cam to it.
Ken