My 09 V had no code issues with just a Hennesey intake, Corsa exhaust and W4ME tune. Recently had American Racing headers/x-pipe/high flow cats installed. Couple days later I noticed the CEL was on. So i scanned the car and cleared a P1133 code. Scanned it tonight and it had the same codes stored 4 times with one pending. It appears to be a 02 sensor issue so im wondering if the shop didnt plug one back in correctly or if the extra flow is an issue. The car only has 7K miles on it. Any suggestions would be greatly appreciated.