[Richard L]

Options:

1 - If the engine is direct injection, the HFS4 will be more suitable.

2 - The aquamist system can only control one channel unless you add a second valve (activated by a pressure switch)

3 - The PWM system may not require a staged injection setup as the flow is proportional to engine load rather than boost only.

4 - I need to know the engine layout before commenting on this.