Air Box Mod Vectra C

Mark Dj

Former Staff
Senior Member
#1
Has anyone done the airbox mod on the Vectra C ie removed that flap thing? I did mine last night, I've not had it out for a drive since. I think I will have to get a better filter for it.
 

Matt

Administrator
#4
The 2.0T may not even have the bottom one then Mark. How did you remove the top one? I had to cut mine off with a hacksaw
 

Mark Dj

Former Staff
Senior Member
#5
Mine just slotted out, it can just slide back in if I wanted it back. Only half my filter was dirty, so that mod must make it work for the full filter.
 

Matt

Administrator
#6
The one on the bottom slides out on the CDTI, the top trumpet is part of the air box, so has to be cut off. Before I removed the bottom, only half the filter was being used.

Since removing the top one, the turbo sound louder when it spools up.
 

Matt

Administrator
#8
Mark Dj said:
I wonder how mine will sound then, I can hear mine all the time :)
You could hear mine all the time as well, but the noise has definately increased since removign the internal pipes from the airbox.
 

rushy

Senior Member
#9
We all remove the bottom one but all leave the trumpet that feeds the MAF. Think it was Nutron who took his top one off on a rolling road session and his performance became worse with it removed. I think its there to speed up the airflow so affects torque?
 

Matt

Administrator
#11
I've not noticed any difference performance wise since removing the top one. I may see if I can get another top half of the air box and see if it does feel any different after driving around for several months since doing it.
 
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