PT4000 stalls a little lower behind a stock head and cam car, yank says its around 3600. SS will have better drivability than a PT due to the higher torque multiplication (STR). PT converters are more efficient on the top end however. take a look on youtube there is plenty of videos of PT converters showing drivability.
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1999 Z28 T-Top M6 - LS6, Bolt Ons, Suspension, MWC Narrowed 9" - 415rwhp 385rwtq 10.847 @ 125.17
1989 IROC-Z H/T M5
2006 F350 SCSB 4x4 6.0L Diesel - Studs, EGR Delete, Powermax Turbo, Extreme Tuning & Exhaust - 13.23 @ 101
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