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As part of a planned upgrade, I will need to change out the std AFMs on my GTR. I already have a PFC fitted.

Common practice/recommendations appears to be to use Z32 AFMs. I am worried, however, that these may be too large to give good resolution for tuning at part throttle/cruising.

Given that I had a single RB25 AFM on my old S15 that supported over 200 kw ATW, would a pair RB25 AFMs be a better choice for a "moderate" upgraded (say 300 kw ATW) GTR?

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Hi Gav, Different bolt pattern, too big in diameter, 80 mm versus 65 mm so you will need an adaptor plate, we use sheet aluminium, although 2 X pods in a CAI are easier.

No problem with low rpm resolution, the PFC copes very well. Done it heaps of times. Following has been our experience...

-------------------RWKW----------RWKW-----BHP--------BHP

#of AFM's------------1-------------2------------1-----------2

RB26---------------149------------299--------271--------474

RB20/25------------226------------453--------376--------683

Z32-----------------262------------523--------424--------779

Q45-----------------302------------605--------479--------890

You really only need to upgrade the GTR AFM's if you are going for 500 bhp or more.

Hope that helps

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