ST4000 vs TP4000
YTP 4000 = better from a roll.
ST 4000 will be a little tighter, but both will be loose relative to a 3500 street converter.
ST4000 hits the tires much harder. Good if you have traction, bad if you don't.
ST4000 has better throttle tip-in during street driving.
TP4000 is a better street racing converter. More controllable hit off the starting line, it multiplies torque for a longer time period, has longer shift extension, and will put down more rwhp. This will make it better when racing from a roll.
ST4000 is a better 1/4 mile race converter with slicks (very similar to the Vig 3600).
TP4000 is a better all-around converter if you can live with it feeling a little mushier around town.

2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
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2023 Corvette 3LT Z51 soon to be modified.
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