His products have killed eight people and sickened 550 more, but peanut baron Stew Parnell isn't giving any explanations, invoking his Fifth Amendment right to silence yesterday at a Congressional hearing on the incident. He also skipped an earlier panel, which heard grieving relatives of victims of the tainted products. E-mails released by House investigators showed Parnell casually dismissing salmonella outbreaks as a routine problem at his plants. "I go thru this about once a week... I will hold my breath... again," he wrote last June in response to news of a positive test for the bacteria. Further e-mails showed Parnell angrily complaining that delays from positive salmonella tests were costing him, quote, "huge $$$$$." Parnell later said in January, after the outbreak began, that his company had never found any salmonella at all.