Quote:
Originally Posted by Jontall
Factory supercharged cars come from the factory with a very very lean tune and that's why the cats don't melt. After-market superchargers kill cats because they are tuned much richer. Run off-road connection pipes and swap back when you need to pass State emission inspection.
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Very lean? Incorrect... pig rich AFR's on factory blown cars like V and ZL1 in low 10s AFR. GM wouldn't even mess with a blown car and cost of warranty on engine hard parts running on the ragged edge just to spare the cats. The factory cats can take the HP of the 450-500rwp of the aforementioned cars with single digit boost. The higher HP boost applications esp on cheap high flow cats is where the problems arise. Several V's in 10 sec club on factory exhaust.