I think one of the coolest parts of Larry's write-up was where he was talking about using the flow characteristics of the port at different speeds to change the effective port area and coutour. i've been reading about 'dynamically reconfiguring ports' using the pressure waves for ... :idea2: must be close to 20 years now. it's usually found in high speed aerodynamics and rocketry ... and Popular Science magazine. :laugh: when Larry was talking about the F16 intake, that's actually one of the less baroque and more straight forward applications. there's rumored to have been black-ops ( just like the Blackbird used to be ) testing on a rocket which used no exhaust bell. it was supposed to have used the shock wave to shape it's exhaust. i had just never heard anybody apply it to IC engines. but once i saw Widmer write that i was all like, "Day-um". check out what he has to say about exhaust porting. that could be added to almost any engine, i should think. it would be dependent on piston displacement, rpm and valve size. i need to get ahold of a fluids engineer and ask how small the valve would need to be for a 6000rpm ~350ci.