if the neon intake mani is anything like the one on my 420a SOHC Breeze (which i'm sure they are identical).. then it's not tuned for any higher RPM then the eclipse one.. the runners on my breeze were INSANELY long.. I atributed the higher HP rating to the straigter design of the exhaust since it went straight out the back and didn't have the extra two bends from going around the motor. plus you don't have the header heat soaking the whole motor and intake system.

having the header in front and intake in back is the stupidest common design i've ever seen on cars. atleast were performance is concerned.