My vert is first time to baught a Automatice transmission car so it feels bit boring to drive so I used paddle shift almost all the time but after using 10 to 15min shifting timing is getting slower I think it because of transmission oil is getting over heated so trying to upgrade transmission cooler for cool down oil temperature. First find transmission cooler, befor I baught a cooler I needed to cheack what size is good for oure transmission if I had over size cooler oil is getting too cold, than make stressed at gears or torque converter. I found stillen transmission cooler for G37 but price is too expensive about $400(Im in South Korea so this price is not include tex and shiping fee so when I get it in South Korea it mite be doubled price) and when I include labor, extra oil about 1L than much expensive than $400 so Im looking for other cheep brand in South Korea I think small cooler doesn't need good brande cooler. It has no big different so I found 19 level cooler core, this product include hose and accessories price is only $100 much cheeper than stillen. after fitted I couldn't feed slower shifting I tested for long term and shor term, it's good all the time even when I use D I can still feels getting better. I think this mode is value for moeny.