You can only mix and match Thrust Bearing (TB) with Thrust Bearing, and Ball Bearing (BB) with Ball Bearing.

So exhaust housings can only be changed within the VF's (BB)22/23/24/27/28/29/34/36/38/42

and seperately only within this group VF's (TB) 25/26/30/31/32/33/35/37/39/40/43.

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"You can turn your back on a person, but, never turn your back on a drug. Especially when it's waving a razor-sharp hunting knife in your eye." - Raoul Duke