Engine bay wise the F9 and Gen 3 Coupe are the same... There are a few places in the engine bay that you will have to contend with to get twins in there.... the main "issue" is really that the chassis is very stiff - which also means there is a lot of frame structure. The Extra width of the F9 might help in placement of the turbos OUTSIDE of the frame.... this can't be done on the coupe and still maintain side exhaust... I am not sure how the new nose will look but I am guessing that it be a little more compact... so this will kinda force the direction toward the coupe setup. I think the LS is narrower the mod motor so this will help... for reference .....here is mine...