Dynatech Headers are manufactured using only the highest quality materials available.  All Dynatech flanges are CNC laser cut and guaranteed to .003”. Laser cutting provides Dynatech with teh flexability to offer many variations in port size and shape to insure maximum performance. Dynatech offers a satisfaction guarantee and a one year limited warranty on most products, and their technical experts are constantly researching and developing new designs and testing them on the dyno, on the track, and on the street.  Dynatech's on-going commitment to R&D is one of the main reasons Gravana sells the Dynatech brand.  You will truly receive one of the best performing and most durable headers available today!