the LE5 has 2.50 piping except the pipe behind the axel is 2.25 so all I really need is a muffler and custom piping for that 2.25. GMPP is a downgrade as its all 2.25. The only restriction I'd have left is the exhaust manifold. But I don't want an aftermarket one as it will throw a CEL. The gmpp one I read is a waste of money. So I guess I'll just leave it stock.
Last edited by Powered By LE5; 03-29-2009 at 10:32 AM.