1. The stock exhaust comes off as one entire piece with only a single flange after resonator.

2. HKS Sport Catalyzer replaces the stock cat with a less restrictive one whle still retaining the crucial secondary O2 sensor to avoid the dreaded check engine light.

3. Here's the HKS Hi-Power S catback compared with the stock muffler. The "S" actually stand for silent and boy this thing really is quiet.

4. Since the exhuast is really for a WRX, we had to relocate some of the hangers to fit the Forester. But once that was done, the whole thing fits like a glove.