The diesel needs to make high boost at a very low rpm so the turbine housing is smaller than what would be needed for a high rpm gas engine power band.n8in8or":12b6s9me said:To answer your question: the HX40 has a divided T3 flange, even on the larger turbine.
The smaller housing can choke the gas engine when trying to make high boost at the higher rpm end of the power band.
May I suggest seriously looking at the BW S200SX-E 57mm turbo (S257SX-E) with the T4 .83 A/R twin scroll turbine housing.
It will more likely give you both a good low rpm response and still provide plenty of power at 5000 rpm.