Hey guys just put this on my wrx with 181@ wheels on 16 psi, my old controller shit itself couldnt create no more boost. put this on and it totaly kicked its ass, hits 17psi by 3200 in 4th gear and holds it perfect there. im so glad i got this instead of something else... Took me about 1 minute to put it on and about 30 secs to adjust and i was soo happy with this product best 42 dollars i ever spent.