Heavier the car the harder it is on the transmission. A EG Civic 2200 lbs vs 3200 lb 4 door Accord going to have different limits. But the rule of thumb is its a Gamble over 400 ft lbs of torque.... I am currently 501 whp and 385 ft lbs of torque on pump 17 psi on carbon synchro m2b4. Torco mtf.