This isnt a no mod needed upgrade. You need a bov for the setup. Either way it is a good deal and whilr the 20g isnt the latest and greatest technology with a good tune it will make low 400s with full spool by 3800.
Btw im not sure whats up with the dyno graph. That is the same graph from chevycobaltss3's car....the guy he bought his car from was the hahn 20g test car. And james was told that that graph was made on 30psi. Eirher way still not bad for the price. I did email hahn asking them where the graph came from to clarif this a bit for me.