4.

We paired our SUs with short air stacks sourced from The Winner’s Circle.

5.

The early Triumph TR6 came with the single-runner exhaust manifold paired with a single-branch exhaust system. In 1972, Triumph started to fit a twin-branch system. In theory, the twin-pipe system performs better.

6.

Ever the perfectionist, Jackson port-matched the new twin-branch exhaust manifold before installing it. This step provided a totally smooth passageway between the manifold and the cylinder head. Here’s how to do it: First, use the mounting gasket as a template to mark the openings of both components. Then, grind open both passageways to match the gasket. In the end, both the cylinder head and exhaust manifold will feature matched ports.