Installing, Tuning, And Power-Checking Hellion's New Turbo System For Three-Valve S197s. HOT ROD Staff Writer Apr 18, 2007. ... and attaching the turbo inlet pipe should be done at this time.

In fact, it was a little time-consuming; taking about four hours to do the inlet pipe and the turbo blanket. This was because the engine bay is tightly packaged against the radiator core support.

A Samco turbo inlet pipe releases even more airflow to the turbo. To liberate exhaust pressure, Andrew utilized a Wicked Tuning system with a 3" stainless steel downpipe, muffler and piping. See ...

The engine at the back of the 991 Turbo / Turbo S is an evolution of that on the previous-generation 997, but AWE tuning claims they’ve scrapped their 997 exhaust design and went for an all-new ...