ls6 is cathedral port it will not fit on G8's...
LSX isnt a manifold its refering to either LSX blocks or LSX as a Whole (LS1 to LS9)
LSXR is a manifold....
hope this helps
2009 Pontiac G8 GT
402ci / Procharger D1SC / Solo 3 inch / Futral "applejuice" Cam / Kooks LT's / Squash / 80# / Vstack / Alky / Futral Trans /
Canada's Highest Dynoing and Fastest G8!