98 ls1 problems

No breather, huffing out the tail pipe, it doesnt do it right away at idle but after a drive or been running for a while and at load in hight rpm. I have not done the zo6 pcv mod yet but have triied a breather and it seemed to not change, and I do have a catch can on the system but that doesnt seem to do what its supposed to do.
Oh sorry about the 1 hp white lie, just easier to type ( being lazy)
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