ls shell, but who knows whats under the hood. btw go b16 trans for N/A or ls trans for boost. also the 1 vs 2 on p72 heads is not jdm vs usdm. i have a usdm 99 gsr and its stamped p72-2. theres no way the previous owner swapped to a jdm head as the 1 and 2 are identical.