Hi Duncan,
i have the VXR MAF & i'm running a 63mm solid ally pipe from the turbo inlet with the MAF in there (yet to get rubber adaptors) along with a K&N filter stuffed into the pax side vent.
a couple of reasons for doing it this way really,
i dont have a std airbox & the 2.2 engine came with a K&N fitted, i bought a load of 63mm pipework & i konw the VXR MAF is better.
let me know if you want pics......
p.s. i know a lot of tha astra VXR boys run the CDTI airbox, but its about £200 quid for the conversion apparantly.....
Edited by John Faulkner, 02 March 2009 - 03:09 PM.
1 area I have not finished is the revised intake to the turbo(have a small bit of time now the tb top hat pipe are getting made by someone else), plan is to run mandrel bent pipework from filter / MAF to the turbo with a silicon reducer. The pro alloy is a good upgrade over standard but has a limit of 350bhp - I am not going to be running this much power but know I can improve on the flow and the mod is done for any future mods and is not going to have any negatives.
So 3 options I am looking at
1. 1.9cdti 150sri thing air box and retro fit to car and already has outlet of 80mm for the MAF - never measured one so so far not sure how easy to fit
2. Decent cone filter sitting in the air intake ear - it is quite far from any large heat source and would get all the cold air it needed - maybe look at a sheild or some extra ducting to it if required.
3. Retain std modded box and revise the oult section and convert to 80mm
Has anyone played much with different setups on the vx???
All of the abouve options are quite cheap which I LIKE 
Regards
Duncan
you can get it cheaper could not see it been more than £100 all in but then maybe someone is making £100 each kit lol. 63mm feels a bit small tbh the pro alloy is 70mm. John are you running the 80mm MAF then? Better than std rubber pipe though 
