you can debaffle the c90 pipes buddy debaffled 2008c90t pipes till the new pipes cametop pipe was easy same as the 50 bottom pipe was much harder becauce of the angle and depth of the pipe for the top pipe he used double holesaw 3inch and inch and five eights bottom pipe has to be drilled and then cut with good quality bimetal long sawzall blade takes awhile for bottom pipe but sound was worth it