You are a respectable tuner. You probably subscribe to one or more tuner magazines and know, quite a bit about your car and/or racing in general. Either that or you play a shitload of GT3. At any rate, you recognize the difference between a wastegate and a blow-off valve. In time, and with practice, you may attain "Racer X" status since it is supposed that you are relatively new to tuning and still have much to learn. Keep, working, and thank the maker that you're not a ricer.
Here'* how to make your very own large tip exaust: