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The AH-1W had virtually no IR suppression.  The turned exhausts were part of AH-1Z development and first flew in June of 2004.  They were originally intended to get the hotter exhaust gasses  of the -1Z and -1Y away from the tail boom, and they also significantly reduced the IR signature.   It was found that not only did they do all that,  they also were more efficient and were retrofitted  to -1Ws as well.