Porsche people don't say "2009 911" - they say 997.2. Here's the full generation map for the 911, Boxster/Cayman, and the SUVs, with the engine eras that matter.
| Code | Years | Engine Era | Know This |
|---|---|---|---|
| Classic / G-body | 1964-1989 | Air-cooled flat-6 | The original lineage, incl. the 930 Turbo (1975-89). |
| 964 | 1989-1994 | Air-cooled 3.6 | First AWD Carrera 4; collector territory now. |
| 993 | 1994-1998 | Air-cooled 3.6/3.8 | The last air-cooled 911 - priced accordingly. |
| 996 | 1999-2004 | M96 water-cooled | The value entry to 911 ownership. Budget for the IMS bearing retrofit on pre-2005 M96/M97 engines; "fried egg" headlights keep prices low. |
| 997.1 | 2005-2008 | M96/M97 | Classic looks return; IMS risk remains (smaller bearing, lower failure rate than 996). |
| 997.2 | 2009-2012 | 9A1 DFI | The sweet spot: new 9A1 engine (no IMS bearing), PDK introduced. Mechanically the safest "analog era" 911. |
| 991.1 | 2012-2016 | 9A1 NA | Bigger platform, electric steering; last NA base Carreras. |
| 991.2 | 2017-2019 | 9A2 3.0TT | All Carreras go turbo. Huge tuning headroom on the 9A2. |
| 992 | 2020-present | 9A2 Evo | Wider body standard; 992.2 brings the T-Hybrid GTS. |
| Code | Years | Engine | Know This |
|---|---|---|---|
| 986 | 1997-2004 | M96 flat-6 | The car that saved Porsche. Same IMS caveat as the 996. |
| 987.1 / 987.2 | 2005-2012 | M96/M97 → 9A1 (2009+) | First Cayman (2006). The .2 cars get the IMS-free 9A1 - the smart used buy. |
| 981 | 2013-2016 | 9A1 flat-6 | Widely considered the best-balanced modern Porsche per dollar; GT4 debuts. |
| 982 (718) | 2017-present | 2.0/2.5 turbo flat-4; GTS 4.0 & GT4 get the 9A2 flat-6 | The flat-4 is effective but divisive; the 4.0 six silenced the critics. |
| Code | Model | Years |
|---|---|---|
| 955 / 957 | Cayenne Mk1 (pre/post facelift) | 2003-2010 |
| 958 | Cayenne Mk2 | 2011-2017 |
| 9Y0 | Cayenne Mk3 | 2019-present |
| 95B | Macan (all gas generations) | 2015-present |
| 970 / 971 | Panamera Mk1 / Mk2 | 2010-2016 / 2017-present |
| J1 | Taycan | 2020-present |
Porsche generations split into pre- and post-facelift halves - 997.1 vs 997.2, 991.1 vs 991.2 - and the differences are often bigger than the name suggests: the 997.2 swapped the entire engine family, and the 991.2 turbocharged the whole Carrera range. When buying or modding, the half-generation matters as much as the generation.
Confirm a car's generation from its VIN with the VIN Decoder (it reads the 911 vs Boxster/Cayman line and year automatically). Factory staggered fitments are in the Tire Calculator presets - Porsche runs them on nearly everything, so check the AWD ±1% rule before mixing sizes on a C4/Turbo.
No single topic dominates used Porsche shopping like the IMS bearing. The intermediate shaft drives the camshafts in the early water-cooled M96 and M97 flat-sixes, and the bearing that supports it can, in a minority of cases, fail and cause serious engine damage. It affects the 996, the 986 Boxster, and the first-half 997.1 and 987.1 cars. The failure rate is debated and generally low, but the cost when it happens is high, which is why the topic looms so large. The practical takeaways are simple: a documented IMS retrofit on an affected car removes most of the worry, and any car from 2009 onward (997.2, 987.2, and everything newer) uses the redesigned 9A1 engine that has no IMS bearing at all. This is the clearest reason the half-generation matters - a 997.1 and a 997.2 look almost identical but have fundamentally different engines underneath.
Reading Porsche by engine era makes the generation map far easier to use. The air-cooled flat-six ran through the 993 (the last air-cooled 911, ending in 1998). The water-cooled M96/M97 era covers the 996, 997.1, 986, and 987.1. The 9A1 family, naturally aspirated and IMS-free, arrived with the 997.2 and 987.2 and carried through the 991.1 and 981. The turbocharged 9A2 era began with the 991.2, when every Carrera went turbo, and continues in the 992 and in the 718 GTS 4.0 and GT4. Knowing which era a car belongs to tells you most of what you need before you ever look at a spec sheet: whether it is air- or water-cooled, whether the IMS concern applies, and whether it is naturally aspirated or turbocharged - the three questions that drive value, maintenance, and tuning potential.
The water-cooled 911 generations are the 996 (1998-2004), 997 (2005-2012), 991 (2012-2019), and 992 (2019-present). Each is split into a pre-facelift .1 and a post-facelift .2 half, and those halves often differ more than the name implies.
They are Porsche's internal generation codes for the 911. Enthusiasts use them instead of model years because a single 911 lineup spans decades; saying 997.2 is far more precise than "2010 911" when discussing engines, parts, and values.
The mid-engine cars run the 986 Boxster (1997-2004), the 987 Boxster and first Cayman (2005-2012), the 981 (2013-2016), and the 982, marketed as the 718, from 2017 to present. The 718 base and S cars use turbo flat-fours, while the GTS 4.0 and GT4 use a naturally aspirated 9A2 flat-six.
Porsche splits each generation into a pre-facelift first half (.1) and a post-facelift second half (.2). The difference can be significant: the 997.2 swapped in an entirely new 9A1 engine family that eliminated the IMS bearing, and the 991.2 turbocharged the whole Carrera range. When buying or modifying, the half-generation matters as much as the generation.
The intermediate-shaft (IMS) bearing concern applies to the M96 and M97 engines in the 996, early 997.1, 986 Boxster, and 987.1 cars. The 997.2 and 987.2 (2009 onward) moved to the 9A1 engine, which has no IMS bearing, which is why those later half-generations are often considered the smarter used buys.
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