My wrx gf8 has the stock AFM (22680-AA160) i have installed an Apexi Powerfc to my car and the options to change for the AFM are:

1.-GC8 Normal
2.-Super Intake
3.-80mm VG30
4.-90mm Vh41
5.-Option

wich AFM will be best to fit? im planning to reach 350hp.

 

Well.... I think (and I totally stand to be corrected)???...:-

1 (or 2?) is selected for the OEM MAF.
3 = Z32 MAF
4 = Q45 MAF
5 = User definable, probably??

- If you have a MY93-96 ph.1 your OEM green label MAF should get you to 350bhp anyway - but it could be marginal. (I witnessed a 1995 Type RA make 378bhp (on a big turbo) and its OEM green label MAF, when Paul at Zen worked his magic about 2 summers ago).

- MY97/98 ph.1.5 orange label is good, I believe, for around 480bhp (it performs all but the same as the Z32 MAF. The Q45 one has a bigger 90mm MAF tube and can do 500bhp I think).

- MY99/00 have a dfferent "cassette/film"-style MAF but don't know what it can flow?

Replacement non-OEM MAFs have to be correctly wired to the ECU loom and scaled in a remap...

 

So it probably looks like you'll be fine on your OEM MAF for 350 (as the 'least performing' is c.350 rated anyway!). Just make sure you use a big enough air filter so as to give it a chance....

 

So there is no benefit for just change the AFM to a Z32? i thought will be...like fast acceleration or better trottle response and max out my ihi vf22.

 

No. If you wanted to go beyond 350 for definite, then yeah, I'd fit a Z32 or MY97/98 orange label one.

But no, AFAIK, you won't get any benefit if the engine's already happy and not demanding more air, IYSWIM...

 

Thank you very much for the help.

 

No worries.