I used a corrado vr6 subframe, mk3 engine with standard inlet and I took 15-20mm off the rear engine mount because it was just touching the bonnet. Seems strange that some people need to and others don't, must just depend on the parts you are using. Engine mounts compress a bit over time (different brands may be slightly different heights and material too) so this will obviously effect how close the engine sits to the bonnet. Remember also to modify chassis leg where the crank pulley is. If you don't it causes the crank pulley to rub on hard left handers.