POrsche 911/ 964/ 933/ 986 Titanium 12 stud and nut manifold set. 

M8 x 1.25mm thread

Fits:

Porsche Boxster 986 2.5L 1997-99
Porsche Boxster 986 2.7L 1999-02
Porsche Boxster S 986 3.2L 1999-02
Porsche Boxster 986 2.7L 2003-04
Porsche Boxster S 986 3.2L 2003-04
Porsche Boxster 987 2.7L 2005 -08/08
Porsche Boxster 987 3.2/3.4L 2005-08/08
Porsche Boxster 987 MKII 2.9L 2009-2012
Porsche Boxster S 987 MKII 3.4L 2009-2012
Porsche Boxster GTS 718 4.0L Manual (400 Bhp)
Porsche Boxster GTS 718 4.0L PDK (400 Bhp)
Porsche Boxster Spyder 718 4.0L (420 Bhp)
Porsche Boxster 25 Years 718 4.0L Manual (400 Bhp)
Porsche Boxster 25 Years 718 4.0L PDK (400 Bhp)
Porsche 911/912 1965- 08/1968 SWB
Porsche 911 09/1968-1973 LWB
Porsche 911 1974-83
Porsche 964 (911) C2 1989-93
Porsche 964 (911) C4 1989-93
Porsche 964 (911) RS 3.6L 1991-93
Porsche 964 (911) RS 3.8L 1991-93
Porsche 993 (911) C2 1994-97
Porsche 993 (911) C4 1994-97
Porsche 993 (911) RS 1994-97
Porsche 993 (911) C2S 1994-97
Porsche 993 (911) C4S 1994-97
Porsche 993 (911) TURBO 1994-96
Porsche 993 (911) GT2 1994-97
Porsche 993 (911) TURBO S 1994-97
Porsche 996 C2 3.4L 1997-08/01
Porsche 996 C4 3.4L 1997-08/01
Porsche 996 C2 3.6L 09/01-2005
Porsche 996 C4 3.6L 09/01-2005
Porsche 996 C4S 3.6L 09/01-2005
Porsche 997 Carrera 2 3.6L 2005>>
Porsche 997 Carrera 2S 3.8L 2005>>
Porsche 997 Carrera 4 3.6L 2005>>
Porsche 997 Carrera 4S 3.8L 2005>>
Porsche Cayman GTS 718 4.0L Manual (400 Bhp)
Porsche Cayman GTS 718 4.0L PDK (400 Bhp)
Porsche Cayman GT4 718 4.0L (420 Bhp)

CORROSION PROOF Grade 5 titanium.

Weight is half the weight of the standard weight.

Reduces unsprung weight.

Grade 5 titanium is also stronger and lighter than steel and Stainless steel. Threads are rolled not cut.