Pie Cuts, 4.00" O.D. (6 pcs = 90 Degree Elbow)

Mandrel bends come in fixed angles and radii, and in a crowded engine bay neither one is ever quite right. Pie cuts solve that by letting you build the bend yourself, one segment at a time. Vibrant 13640 is six 15-degree sections of 4-inch OD T304 stainless; welded together, all six make a 90-degree elbow, and you can use fewer for a shallower angle or clock each piece to roll the bend around an obstruction. The segmented look is also popular on show builds, where the row of welds is part of the appeal.

Specifications

• Part number: Vibrant 13640
• Outside diameter: 4.00 in.
• Pieces: 6, each 15 degrees (90 degrees total)
• Material: T304 stainless

Fabrication Notes

Pie cuts must be welded to each other. Clean every edge with a stainless brush and acetone, tack each section at four points to check alignment, then fully weld. Back purging with argon is especially important on a stack of pie cuts because there are so many joints, and a sugared root inside a turbo inlet or intake can shed debris. Keep heat input low and alternate sides to keep the stack from pulling out of line.

Where They Work

Four-inch pie cuts are common on turbo inlets, large intake tubes, intercooler piping and big-diameter exhaust, especially when space is too tight for a long-radius mandrel bend.

Frequently Asked Questions

Can pie cuts be clamped instead of welded?

No. Pie cuts are individual segments that have to be welded together to form a bend.

How many do I need for a 45 degree bend?

Three 15-degree pieces make 45 degrees. A full set of six makes 90 degrees.

Are they stainless or aluminum?

This set is T304 stainless steel.

Fitment: Universal. Confirm the sizes and thread types listed above against your application before ordering.