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If your air filter looks something like the first photo then you will have trouble fitting a second battery.
The GU TD42T or ZD30 air filter housings (as per second photo) will fit in the front corner of a GQ engine bay and only require you to drill one or two holes to make them fit.
Alternatively you could get an aftermarket Patroldocta air box which fits in the same position as the GU factory air boxes but flows better (third photo).
Tony
Last edited by YNOT; 26th November 2011 at 07:27 AM.