I put one on my Hi Lux . We sealed it all up properly but main difference was fuel economy was heaps better and there was also way more grunt down low.
It made a huge difference and would be first thing I d do to a vehicle .The savings in gas money were great. It was probably 50 to 60 kms further per tank.
Dont ask me why I have no idea but it worked... Actually probably better air flow as the under guard connector you throw away was pretty pathetic.
Common sense in rivers prevails of course (usually not !!)
Be chopping a hole in that FJ front guard very soon ....
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