........for a MY05 WRX?

One that does not mess up the MAF, gives a good BHP hike and does not cost an arm a leg??

 

I would go for a RCM induction kit , they are around £202 brand new , they can be picked up for around £80 second hand on eBay and on the marketplace forums on here as well.

I have on my 2006 2.5 WRX and not only do they look but they give a distinctive induction noise as well.

 

No MAF issues?

 

I got mine after speaking to Bob Rawle prior to him mapping my car about whether to fit an uprated panel filter or go with an induction kit. He did say that the classics are more prone to MAF failures with oiled filters but newage MAF's are not prone to these problems.

He does recommend the RCM induction kit on his website for stage 2 upgrades I believe and he certainly knows his potatoes.

 

I'm only thinking about peripheral upgrades at the moment.

The RCM kit looks the stuff!

Thinking about it seriously.

 

check this out

http://www.mkiv.com/techarticles/filters_test/2/

 

APS 65mm CAI, you can't get better for what you want.