Lincs_Zed

Morning Quick description i suppose. 2009 370z GT Ultimate with 76,000 on it. Recently bought the AAM short tails but when going to fit them saw that the midpipe flanges were rusted so bought the AAM midpipe aswell. Now the AAM website claims that the combination of midpipe and short tails results in around 22whp over stock. Took my car to get ECUTEK with the new exhaust already fitted and the first dyno run showed 322, after the tune 332. What are your thoughts? Was i wrong to be expecting more? i know the stock cats are restrictive.