stock TII Size?
No bumps in this section.
The Series 5 runs a larger turbo with dual wastegate flaps. It has a 1.0 A/R exhaust housing where-as the Series 4 has a 0.88 A/R. Compressors are very similar. Physically if you put the two next to each other the Series 4 has a flat-ish look to the exhaust housing , the Series 5 has a more bulbous look.
S4 TURBO - Flat looking small exhaust
S5 TURBO - Larger exhaust housing
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