I'm not so sure about that.. It was always said that the Servals actually needed a "top end" pipe to make them work really well.
The port timing of the Servals are low as is, so they don't really need any help in that department.
Actually, I think it may have been Gary at Sniper who said that.. And so far, Snipers have worked well on the Servals.
One thing I know for sure is that the SLP will sign off a lot sooner on top than Sniper, CPI or Shearer.