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Originally Posted by former 240 s14
5. D088 Coolers - This is obviously a must.
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Check that, if there's still time. People don't always get lower temps with these. Not saying they're bad; just that they're no guarantee of better performance vs. new OE coolers.
The do88 oil cooler uses a bar-and-plate design, which gives it more mass than the stock tube-and-fin design. And it's bigger, so more capacity and even more mass. So, temps might climb more slowly. But bar-and-plate dissipates heat less efficiently, so peak temps during long sessions might not be any lower.
The do88 engine coolant radiator looks like it's just a bigger version of the stock piece, but not by much.
Neither piece can be expected to be up to OE standards in build quality; sometimes they are, sometimes they aren't. And the additional size can cause fitment headaches.
I can't speak to DCT, so maybe there's some benefit there. For MT, AFAIK, there's zero evidence the stock cooler isn't enough. In fact, it has a block-off plate from the factory, so if you're worried, maybe you can just remove that (I have no idea what the implications would be – it must be there for a reason – so don't take this as advice).
The stock cooling system is quite good, honestly. When new, it can handle hot summer track days easily. Performance degrades with time, so you'd probably see an improvement by putting in new OE coolers and making sure all the ducting is in place (including the stock undertray/splash guard – that's important).