The 911 R rear underbody diffuser is now available as a retrofit for the 991 GT3 and GT3 RS! We have tested this on a 2015 991 GT3 and it looks incredible. Several in stock and ready to ship out! Porsche 991 R Rear Diffuser - Suncoast Parts! Redeveloped engine underbody paneling with an increased surface area compared to the 911 GT3, as well as four additional fins. Made of stamped aluminum and shaped so that it rises toward the rear. It thus fulfills the function of a diffuser and ensures downforce. The four plastic fins channel the airflow under the rear, further accelerating the airflow and increasing the diffuser effect. A direct fit for 2014-2016 GT3 & GT3 RS models, but minor modifications could be required to match openings on the original engine cover. Due to the aggressive aerodynamic effects caused by this product, consult a race specialist to ensure aerodynamics are balanced for high speed or race applications. Not compatible with standard 911 models.
Discussion summary
YOUR RESEARCH991 R Diffuser
1 matching discussions were examined; no attributable action/outcome evidence was detected. No consensus or repair conclusion is claimed.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Read captured repliesInsufficient extracted evidence does not mean there is no answer in the original discussions.
1 matching discussions · 1 captured posts examined · 1 partial discussions
Coverage and how to read this overview
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
1 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
- Planet-9: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T112012Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
This is a source reference. Confirm exact model applicability in the original material.