Pre-drilled for pyrometer probes; Gaskets are available separately; 6.7L performance stock replacement manifold for use with the Holset HE351 Turbo; Cast of high silicon ductile iron to withstand extreme temperature cycling caused during DPF regeneration and in high performance applications; Larger porting design than others will handle any increase in power; Thick walled casting and integral slip joint prevents cracking and exhaust leaks; Experience quick spool times and low drive pressures with an overall increase in performance; Fully EGR compatible; Open throat outlet flange outperforms the stock manifold; T4 outlet available with fully divided pulse manifold design