Originally Posted by
170k240
pie cuts are gay. period. unless youre making something out of titanium, pie cuts are not needed. titanium cannot be mandrel bent like other metals so you have to pie cut any bends. anything else should not be done this way its no necessary.
the manifold in the OP is not titanium but the rest of it may very well be.
Using mandrels for bending tube: Type and placement are critical for successful bending
Mandrels typically are made from an aluminum-bronze alloy or a tool steel with hard chrome plating. An aluminum-bronze combination is used to bend stainless steel, titanium, INCONEL®, and other hard materials. Chromed tool steel mandrels shouldn't be used to bend stainless steel, but are useful for most other hard materials and also for mild steel, steel, copper, aluminum, and other soft materials. There are also some situations in which chromed tool steel mandrels can be used with more success than aluminum-bronze for bending titanium and INCONEL.
Titanium can be mandrel bent, ready cut mandrel bends like stainless, mild, and aluminum just arent that easy to find, either way, a pie section can be very handy when fabricating something, not many were used in the manifold itself, but as you can see, can be helpful even when building an eleventy billion dollar exhaust.