Not sure what DP this really is. I believe it is a 1st gen stromung shorty, which does not have the bellmouth or additional pipe leading back into the main DP. I flashed to Cobb Stage 2 before I even drove the car with once the DP was installed, so not sure what the effect of the DP were by itself, but I can say that the car seems def. gained some low end with the flash, up and dp. Also, mid range acceleration seems to have improved quite a bit! One noticeable difference in after the DP was that my exhaust note is now a little deeper and louder than before. I assume this is because the cat was removed. All in all a positive mod and very happy. Only thing I would have done differently would be to replace the gaskets with the DP install.