I just removed the Air Box out of my Elantra. I replaced the standard filter with a conical one at the end of the elbow that comes standard on the vehicle. It seems to make a difference at the high RPM range but at the low to mid-range it seems to bog the car down. Any Idea or insight.

Thanks

 

Did you try and reset the ecu?
That might help.

Check this page out.
or
this one

or this one

 

did you put the air temp sensor inside the cone filter?

 

I'll try disconnecting the Batt. Terminal to reset the ECM.

No I did not put the Temp. Sensor inside the filter. Would it make a difference..

Thanks

 

Assuming everything is connected properly, we did some experiments with that kind of a setup. What we found was that when a short intake is used, there isn't a sufficient volume of air available in the intake tube to fill the manifold at low rpm, high throttle conditions.
There are 2 solutions:
1) Increase the length of the tube, preferably running it into the fender well for cooler air.
2) Install a "tank" that has approximately 3 times the volume of air for about 6 inches of intake tube length.