The only thing I know from personal experience is a STOCK Honda Civic
chassis can barely handle what the small VTEC engine is capable of.I
have had the car up to 105 mph on the freeway (I know,that is an insane
speed) and the vehicle ALMOST lost control because of the body and poor
suspension (it almost rolled on me).I felt that the engine was capable
of even more,but I certainly am not going to try it in my lifetime.I do
not know if the 145 mph speedometer is indicative of anything,but I do
not understand the rationale of putting in an engine capable of those
speeds when the body dynamics can barely handle it.At high speeds,I
noticed that the back end tended to lift off the ground
somewhat....perhaps a rear stabilizer (wing,fairly large) would help
this.