IS38 Downpipe Choice

Looking at 2 different downpipes, the 4" Trackslag and the 3" by IE. Theres very little posts about the 4" which isnt helping me decide. I plan going is38 this summer and Ive read that the 4" give faster spools and make the is38 feel like the is20, does anyone have this on their gti? Is the 4" better or should i stick with 3" IE. I plan on upgrading to a Standard Vortex in a couple years, I just want a nice step up in power to enjoy the car again and I also dont want to get into fueling right now😅 (hoping more 🌽stations open in CT before I do switch ) What downpipe do you have if you've upgraded to an IS38?

Looking at 2 different downpipes, the 4" Trackslag and the 3" by IE. Theres very little posts about the 4" which isnt helping me decide. I plan going is38 this summer and Ive read that the 4" give faster spools and make the is38 feel like the is20, does anyone have this on their gti? Is the 4" better or should i stick with 3" IE. I plan on upgrading to a Standard Vortex in a couple years, I just want a nice step up in power to enjoy the car again and I also dont want to get into fueling right now😅 (hoping more 🌽stations open in CT before I do switch ) What downpipe do you have if you've upgraded to an IS38?