im sure its possible but looking at the flow # that rob posted on the dual cai and the inc boost that a c3 can push in cooler weather imo a tune is mandatory. your ingesting what almost 300 cfm more than stock airbox and inc boost by almost 3 to 4 psi. thats a lot for an ecu to adapt to.
think of it this way, a new replacement engine for a slk32(srt-6) is $36,000. people drop thousands on mods and cool looking stuff but datalogging equip. is typically the last thing they buy. when modding logging is critical and the only way to truly know if you need tuning or not. i did the same as most others and didnt log, then 3 55 engines blew up in just a few months apart and my logging started!