Intake Air Filter Noise after highway driving
 

Okay so with my rx8 i have to make about a 10 minute trip on the highway at about 120km /hr . But once im driving i notice its lacking power , than if i put it in neutral when i get off the highway it will die. if i keep it running it runs shitty and when i get it over 4000 rpm the intake noise sounds like a rough kinda like deep choppy noise, i cleaned the maf but dont know what else to do , once i stop the car sit for a bit and start it , redline it in neautral a few times its fine. ive seafoamed it like 2 weeks ago so any suggestions? new air filter? no cels


thanks

- Coils, plugs, or wires failed, clogged the cat
or
- Compression is low on the engine and as it heats up you lose power

A few other rarer problems.