A common G-series upgrade is swapping in a 993 3.6L engine, which lifts a US-spec 3.2 from 217 hp to ~270 hp with improved fuel injection and hydraulic lifters. The conversion is non-trivial — DME and harness integration matters — and seller transparency about how much of the swap was completed by prior owners vs the current seller affects buyer confidence.
993 3.6L engine swap into earlier G-series — power upgrade path
Porsche 911 (G-series) · modifications