Spool up time would be the least of my concerns if the car was mine. I only mentioned it because you were told that by keeping the cats the turbos will spool faster. This is not true.
I would be worried about the cat failing and then picking the turbo in pieces.
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2011 Twin Turbo PW nismo #113 - My Journal - My TT Build Thread
[ GTM GTX Stg2 TT || HKS EVC6 || Custom CarPC || F.I 3'' TDX CBE || SB 6puck clutch/ZSpeed CSC || BC BR Coilovers || SPC camber arms || Work VSS-X || Custom Headlights || PW:JDM CF Covers || Seibon CF Engine Cover ]
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