Flange pipe connectors D-55 409sus

Straight Flow is a Dutch exhaust brand, and its range here is universal exhaust components for building or modifying a system rather than complete, car-specific exhausts.

The largest groups are flexible pipes, in interlock and SuperFlex constructions and a choice of diameters and lengths, and silencers and resonators in round and oval bodies. Alongside them come stainless steel and aluminium bends at common angles, straight tubes, V-band connectors and clamps, exhaust tips in straight and slant cuts, lambda sensor bungs, Y- and X-pieces, flanges and heat shielding.

The range also includes universal catalytic converters, with the substrate (metal or ceramic), cell density (200 or 400 cpsi) and emissions class (E4 or E5) given in the title.

Because the parts are universal, they are chosen by diameter, angle and length rather than by car. Compared with the other exhaust brands here, Straight Flow offers a broad choice of flexible sections and universal catalysts, which makes it useful when you are fabricating a system to your own layout.