original trd spoiler for MR-S is expensive. (new is RM4K++) ; even a used trd is sold RM1.8K-RM2k in japan. most owners would just opt for universal GT spoilers for look.
spoilers for MR-S
trd, cusco, C-one, illusition etc
best is for beginners (owners) look for hyperrev for MR-S. it's a dated but it allows you to have a glimpse of whats available.
I recently upgraded to stainless steel piping/walbro fuel pump however my actuator kong twice resulting over boost.Recently my con rod bengkok and piston damaged.
I'm quite sure there are alot of ppl using Toyota Supercharger pistons on their GSR or 4G93 BOT. I guess there are also alot of ppl using it on reboer 4G91 and also 4G92.