If you feel comfortable piecing it together yourself, get the biggest core you can fit or run dual cores if you can. Then get a mocal thermic bypass to insure it doesnt get too cold during normal driving and DONT skimp out on the fittings. Many people do that and they end up regretting it later on down the line.
As of right now, nothing is covered under warranty as far as oil coolers go. I've heard of many dealerships honoring the warranty when you use stillen parts, but I really dont believe that applies to oil coolers.
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