First start up after priming new motor. Once I fixed Boost leak idle was normal. Car has a fully built block- cp pistons, manly turbotuff rods, acl main/rod race bearing, 2011 nitrate crank, high volume oil pump, arp head studs, cosworth hg, gates racing belt. Heads were 07 decked STi heads, port, polish, gsc s2 cams, supertech dual valve springs and ti retainers. Big rotated 35r. And every supporting mod imaginable
525whp 93oct 35r STI SUBARU VS R35 NISSAN GTR COBB TUNED
STI LOW Boost VS 2010 GTR TUNED SUBIE- had a passenger GTR- NO passenger
600+whp "STIROID" Built Sti 280 cams cold idle
"STIROID" Build. Long list of parts. Brian Crower Stage 3 Cams, Invidia N1 race muffler. Tuned by Aaron @ Boost Controlled Performance I built the engine myself the "knocking" sound is the pistons. 0035" PTW clearance when cold will make that noise on Subarus because the pistons are so short.