It's an inside joke of sorts. Basically, Seedy made a post yesterday about how he cracked his driver's side manifold and Haken came into the thread with his water injection sales pitch and told Seedy that if he had been running water injection that his manifold wouldn't have broken.
"It's been my experience that straight-line acceleration is probably the first aspect of automotive performance that any intelligent driver gets bored with." - Peter Gregg