Icengineworks Header Modeling Blocks

See the assortment here: icengineworks.com/exhaust-hea...
The original icengineworks product line, developed for the design and fabrication of custom tubular exhaust headers. These kits feature 1” long straight and curved modeling blocks molded in a variety of ODs and centerline radii (CLR) that simply snap together to make compact custom designs. Included adaptors allow you to attach modeling blocks to the exhaust flange on your project. Also available are cutting kits, which allow you to make quick and accurate cuts perpendicular to the tangent. Save time, material and money with these handy kits!

[@Hitman-ds1ei]

Brilliant, absolutely brilliant ! Experience and skill in building hand made exhaust doesn't happen overnight but with this system you could match a veteran with finished product in a lot shorter time ! Quoting and consumables estimates way more effective and accurate too I would assume