not a turbo S front bump... but here's some ideas!
this is a mock-up, so am going to replace the things in blue with some correctly angled couplers... but in general, its 2.25" from compressor outlet until beside the driver side headlight, where it goes to 2.5" the rest of the way.
The core is VERY large for what the build is (TT225 turbo, 3" turboback, unitronics stg 2+ on AWP ecu)
I just chopped the sheetmetal at the end of the driver's side frame immediately behind the headlight... has no structural purpose, and lets me fit 2.5" pipe behind there -- will replace the current 2.25" when my new stock arrives...
For the core in the front, it fit amazingly perfectly inside the rad support framework (core is 24" x 12" x 3", end tanks measure 32" end-to-end). i notched the lower part to allow the core's lower mounting tabs to essentially slide into grooves, then bolt in place from the bottom. The rebar was trimmed only 3/4" at the widest part of the top, and i opened it up a fair bit undernead to allow some air to reach the upper section of the core.
When done, the 2.25" to 2.5" transition will be at that blue coupler next to the intake filter, and the rest is 2.5". this is arguably a better platform to build a FMIC for than the golf/jetta (i have done about 7-8 of these for me and others) because the rebar is like a TT and has toooons of space.
The lower cover and fogs are not going back in - instead a light bar with some stainless heavy duty mesh to protect the FMIC core.
This is not meant to be a pretty car... may offer no insight to your request for fitment in a turbo-S skin, but it does show some good fitment options under that skin.