I got mine from ebay for about 20 english pounds. I think I will adapt it a little, just out of curiousity what happens should it come off while driving?
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It cost me the same to make mine, its almost identical to the Jabba. I've got the measurements if your interested.
If it comes off I'm guessing it'll register a fault as no air will be passing the MAF, your car will be sucking in unfiltered air (not what you want).
I've noticed that this is a common occurrence with the newer production year cars. For example, 2001 (AWW) and 2002-2003 (AWP) have no issues holding boost perfectly, but 2004 and 2005 MY's have issues holding boost properly sometimes, even with the same exact software. Its not 'surging' by definition, its a mere fluctuation due to the wastegate opening and closing, but it only happens is SOME cars. Not all.