i have an 06 c,t. d. i was thinking of putting a smoke stack on my truck. i was thinking of just getting a kit to keep my cat and just cut the pipe and just get a 90 and have it go straight up. will this affect my warrenty in any way? does anyone know where i can get a kit,and how much will it cost?i see in diesel power mag that grpipes sells a kit they sell a two stack. has anyone done this?i just love that look and sound of the big rig. i also plan on a tunner of somekind. thanks