so i just got an AP for my 04 sti with 100,000 miles. and aparently i'm only getting about 10 psi from my turbo.
my car is almost as fast as my brother's protuned stage 2 07 wrx that does 17.5-18 psi. so i'm wondering if the AP is reading wrong or is my car really supposed to be that much faster still? i have an exhaust leak between my downpipe and my cat back...the cat back is the only performance mod. car just got new plugs, serpentine belts, timing belt, pulleys, and water pump.