|May 3, 2012 - Here's an interesting comparison.|
That's the stock air filter from an LS7 (505 hp) Corvette on the bottom. On top, the air filter from the 638 supercharged LS9. Guess which one flows more? Installing the LS9 filter is worth around 5 hp and it drops right in. Since we're buying a new filter for these cars anyhow, it only makes sense to get the best.