I would go with either the Orca vc4 pro or a speed passion lpf. Both will handle down to a 5.5. Both a really good speedo's and will be ideal for what you want now and in the future.
I used an lpf in my 511 with a 5.5 for months. I only swapped it out when I got a pro, and put the lpf in my 2 wd
Thanks
Matt
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