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This is the list of everything needed to swap an Evo X turbo onto a Ralliart. If its not listed, the Ralliart has the same part # and can be reused on the new turbo setup. This list should be comprehensive and complete. Its even broken down into required and recommended pieces.
Prices are list prices from Mitsubishi.
Required (a complete turbo assembly off an X should include all of this):
1515A183 (1515A198) Turbocharger $2,022.79
1555A476 Exhaust manifold $514.82
MN119784 Exhaust stud x2 (these will not come out of your Ralliart turbo without breaking) $9.73 x2
1515A150 Turbo Outlet pipe $62.20
1515A184 Turbo to manifold gasket $44.10
1555A289 Turbo to 02 housing gasket $40.37
1555A423 O2 housing $171.77
1225a155 Oil feed line $27.22
1225A181 Oil return line $75.97
1310A469 Coolant return pipe $12.10
1310A577 Coolant feed pipe $25.20
MF650114 coolant banjo bolt x2 $7.37 x2
MF660065 coolant banjo bolt gasket x4 $0.95 x4
1542A042 Inlet elbow $61.08
1515A053 Inlet elbow gasket $10.10
1570B095 Downpipe $304.52 (it would be cheaper just to get an AMS widemouth downpipe instead of stock Evo downpipe and O2 housing)
3078.50 + 27.22 +304.52 total list.
1055.71 + 27.22 + 304.52 without new OEM turbo
Recommended but not required to work:
1555A320 O2 housing bracket 19.08
MR258477 Oil return line gasket 1.53
1515A166 Compressor housing bracket 19.08
MF140264 Compressor housing bracket bolt 2.23
MF140260 Compressor housing bracket bolt 1.30
MR281085 Turbo outlet pipe gasket (same as Ralliart but new ones are recommended) 4.65
47.87 total list.
Of course you can add in aftermarket parts, etc. this is just the OEM stuff. Thanks for reading

Required (a complete turbo assembly off an X should include all of this):
1515A183 (1515A198) Turbocharger $2,022.79
1555A476 Exhaust manifold $514.82
MN119784 Exhaust stud x2 (these will not come out of your Ralliart turbo without breaking) $9.73 x2
1515A150 Turbo Outlet pipe $62.20
1515A184 Turbo to manifold gasket $44.10
1555A289 Turbo to 02 housing gasket $40.37
1555A423 O2 housing $171.77
1225a155 Oil feed line $27.22
1225A181 Oil return line $75.97
1310A469 Coolant return pipe $12.10
1310A577 Coolant feed pipe $25.20
MF650114 coolant banjo bolt x2 $7.37 x2
MF660065 coolant banjo bolt gasket x4 $0.95 x4
1542A042 Inlet elbow $61.08
1515A053 Inlet elbow gasket $10.10
1570B095 Downpipe $304.52 (it would be cheaper just to get an AMS widemouth downpipe instead of stock Evo downpipe and O2 housing)
3078.50 + 27.22 +304.52 total list.
1055.71 + 27.22 + 304.52 without new OEM turbo
Recommended but not required to work:
1555A320 O2 housing bracket 19.08
MR258477 Oil return line gasket 1.53
1515A166 Compressor housing bracket 19.08
MF140264 Compressor housing bracket bolt 2.23
MF140260 Compressor housing bracket bolt 1.30
MR281085 Turbo outlet pipe gasket (same as Ralliart but new ones are recommended) 4.65
47.87 total list.
Of course you can add in aftermarket parts, etc. this is just the OEM stuff. Thanks for reading