Thorley Header Project Update
VEHICLE: 2008 PONTIAC GRAND PRIX GXP 5.3L : 325-cid : V8 : GAS FI : MFI Normal C : LS4
OPTIONS: None Selected
PREFERENCES: None Selected
Doug Thorley Headers
325-C Sandrail Header; Straight Back; Tube Size 1.75 in.; Collector Size 3 in.; Dual Exit; Full Length w/Bomb Shell Mufflers; $759.00 $636.00
328-C Sandrail Header; Tube Size 1.75 in.; Collector Size 3 in.; Dual Exit; Mid-Length; Flanged; No Baffles; $626.00 $525.60
Can anyone explain this?
The Best V8 Stories One Small Block at Time

