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A 1000bhp RS13 will do 265mph. Smooth flat floor, disc wheels to reduce drag and 275mph is doable, 1350bhp 300mph, 2200bhp for Mach0.5. Whatever engine you have, it will go better in a SX and they all fit. Straight 8's go in by moving rad in front of slam panel, BMW V12's go in like they were made for it.