If your going to run standard boost then fitting a new oe cooler will be fine, thou I'd have to ask why? Is your cracked or something?
Traditionally, P2 T5 and R models suffer from 'heat soak' quite badly. The aux cooler fitted on the R models was meant to try and eliminate this problem. It does help, but IAT are still very high, from what I've seen on certain tests.
However, if you want to run higher boost than oe (or if your car has been remapped) then I would advise you fit an after market cooler. The oe coolers are known for cracking and running higher than stock boost will inevitably lead to a cracked cooler, as I have recently found out.
From what I understand, fitting an after market FMIC is definitely the way forwards, will decrease you IAT's (especially during warm weather), mean you can safely run higher boost and most importantly improve performance considerably. I believe up to 20 HP gains can be met!
This is why I have chosen the aftermarket route.
Keep an eye out for my TW FMIC thread in the Modifications section.
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