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I wouldnt theres not enough horse power for a 4 inch system, 3 inch is plenty big. you will actually not gain anything from that big the exhaust needs some back pressure. Unless this is some special trailblazer that has a duramax diesel it in. which i doubt. Get a 3 inch system with dynomax race bullets.
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2000 Pewter Trans am, M6, SLP Lid,LS6 intake,Kooks 1 7/8" Long tube header,Classic Chambered Powersticks, hurst,off road X-pipe, Strano springs & Koni's, Monster level 2 clutch, HPtuners wide band tuned and a homemade ram air box sealed off.
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