we found my major leak on the driver side (between the headers and the exhaust) the flange was 100% straight ... the problem is the cheap gasket that come with headers !
i replace it with custom one and now PERFECT
as for the other leak on passenger side that come from headers we just tight it again and now perfect seal.
but my concern is not the quality of the headers but the HP....
STILL HAVE 385 HP AND 367 BEFORE @ SEA LEVEL SEA 5 ON THE DYNOJET
we are far from 40-50 hp at the wheel!!!!
but maybe i mist something