I'm willing to bet the Greddy R valve sounds like the Mopar and the TiAl sounds like the Greddy S, with less high pitch at the beginning.

My favorite would be the Mopar. Don't mind my obsession with quieter, stocker sounding valves and being indiscrete.


4drwhore --- Do you have knowledge on the principles of how engines are built? If so, you would know that it has alot to do with bore and stroke ratios. Take for example, my KA24DE from a 240sx. It can produce plenty of low end torque and still maintaining enough power to get it through the powerband, but it's design only requires it to rev to ~6500 or so to be efficient. A honda VTEC motor, on the other hand, is designed to utilize a powerband that has been shifted towards the high RPMs and thus, will make its power later, but at a loss of some (or alot ) low end torque. IMO, finding the balance between the two will provide the ideal street car.