Only mods I have on my TT6’s engine is a HKS bov.
I go up and down like a roller coaster, one month I think I want to go bpu and the other months I want to keep it stock so it’s as Toyota intended.
I have owned it over 3 years now and it hasn’t had any other mods apart from the bov as mentioned.
I had a standard exhaust on my first Supra, I personally found it far too quiet. I currently have a Blitz Nur Spec R on my current Supra, I fell more in love with the car once it was fitted. It makes it more fun and exciting to drive when you can hear it growl
No turbo problems as of yet, but I have only owned it for 3 years