well ..for a stock motor..either will be reach about the same..ur not goin to want to run more then like 10lbs on a stock motor..which for a b16..would be about 240whp or so..which wont cut low 13 high 12s for a heavy civic si..maybe high 13s....id say ..go turbo..u have a huge head room..becuz after he boosts his stock motor and isnt satisfied..he will start buildin it up and want more boost..which will be achieved easier from a turbo then sc..imo...so if he wants..go turbo for now..get ahold of a gsr bottom end..build it with forged internals..slowly..then use that bottom end and push up the boost and put down about 350whp..and then ur goals will be met..