I have a quick question. my a4 is fine if i drive it fine and you can WOT all around and it shifts/downshifts fine. But after I WOT for about 30 or so minutes I think my trans starts to get hot because my 1 to 2 shift doesnt feel as hard, and if im going about 45 and I floor it, it will downshift to 2 and slip for a second kind of acting like it has a stall but I dont. Do I need to get a trans cooler? If so any particular brand or kind? Thanks