*** IN STOCK SHIPS TODAY *** For the racer that is running the new type Hemi blower manifold RBS carries these SFI approved 4.50" diameter burst panels. This panel is a must for high boost applications and will keep the supercharger and manifold damage to a minimum if the engine over revs or engine tune up is not at maximum performance. Fits all industry standard Stage 3 Hemi intakes with twelve bolt burst panel configurations. Panels are designed to rupture at 225 to 250 PSI. The more you buy the more you save.