I installed ZZP catback on my 2007 SS/SC lsj, and immidatley i noticed a slight hesitation, drove around seemed okay. Drove it like an hour later and I had codes on my cluster. I scanned them and got these codes; p0030- heated 02 sensor heater control circuit B1S1, p0036 -heated O2 sensor heater control circuit, p0102 mass or volume air flow A circuit low input, p0443- Evap emmission system purge control valve circuit. I thought it was a bad O2 sensor but when i watched the data on my scan tool it seemed to operate properly but my maf was stuck at 25 lb/m under acceleration and idle. I contacted zzp and the man Turbo Tim replied suggesting to check fuses. So I checked fuses and my exh fuse (located upder the hood bottom middle of box) was blow, i replaced the fuse and everything is totally function again. A little 10 amp fuse. Hope this helps anyone and everyone.