airbox problem

[T. 12 E E D.]

I've just fitted a bmc cda on my 182 and when i'm in 2nd gear and give it full throttle it goes upto 2500-3000rmp fine and is sluggish from 3000-4500 then fine again does anyone know what could be causing this ???

 

[whatisjustis]

Just do the usual checks. Clean out the filter and throttle body and make sure all the seals are tight.