Originally Posted by woody

I actually did some temperature logging tests some time ago on my PT, measuring various points along the inlet tract and under bonnet areas where most aftermarket filters sit. The coldest point was actually in the inner arch where the stock intake drew its feed from, and the hottest was right where all those aftermarket 'cold air' systems sit! I can do a similar test on the xfire if anyone is interested, but I'll post the PT graph later so you can see what I mean.

Simon.