phunk that cooler looks quite good and would be ok for the street. However when you give your engine a constantly hard time like circuit racing/rallying or drifting and aftermarket one is a must as you will need the flow it produces.
I got a permacool one from rocket industries which does up to 250hp for $200 with all lines adapters etc etc.

Yeah, I also belive it will have a little negative effect on Coolant temp as opposed to an external cooler.

I am still tossing up whether to pump the oil through this then to the turbo or run them seperately. The first way would only cool oil for the turbo.

i belived that you want something like this.
my setup was made by me and does not have any valves or outher sings .just take the oil out to paas on the radiator to cool down and goes back to the engine.no valves no nothing.can see for what purpose.just a radiator ,2 tubes and the sanwich plate.

see the pictures on my profile

for oil cooler systems there are temperature regulators to only send a small amount of oil to the cooler until the engine warms up, that way the oil isn't too cold, and the engine warms up quicker. The check valve is used in dry sump systems, I use on on the outlet or the oil pump, so I only ever have to re-prime a small amount of the system.

I see rotary oil coolers sell on Ebay for $20-40 all the time. I bought a 13 row Serck cooler for my set up. I'm also running thermostatic sandwich plate with -10 lines and fittings. Cost heaps but hopefully will save this motor from cooking on the track.
Matty