0.03:1...... your def going to notice a HUGE difference there:bang. there is less than a MPH difference, around .75 faster, ive had both the 1356 and the NP241 apart, the 1356 is physically larger, but both have decent components, niether one is manufactured by Fisher Price, the NP271's and 273's in the third gen dodges, and superduty are huge, and ive seen more damaged cases than either of the other ones. the Dmaxs are tiny and you rarley ever see them break, so who knows, they're all good untill they snap.