I have read many Exhaust threads and I have learned alot. What Brand Exhaust system is made out of material that is thick enough not to crack under great stress. Is large enough to get as much heat away from the turbo and has the smoothest lines (least curves or bends). Of course I am not wanting to spend more than I need to. I see prices around $450-$500. I am also confuse on whether to put pyro sensor before or after turbo.

Pre turbine pyro temps are more accurate than post and rise faster. I hear good things about the 4" systems that are out there. JK, ssdiesel and others sell them.