Dont do it! Lol . Sav is right, serious Leggy owners swap to a single T. They are fine when running spot on and easy make 300 bhp but are a headache when they dont run right.
H6 with supercharger seem to be a way to go but can prove very tricky to set up.
If me Id just stick with a EJ20 with a VF35, FMIC, Map etc 340 bhp with a nice spool, bang bang bang through the gears