I have an '05 M3 with a Dinan S3 install (no intercooler or oil cooler). Daily summer driver and solo/track days. In Canada with lower daily/track temps and 94 octane fuel. Not changing to turbo or another setup.
Considering increasing boost and talked to Dinan who said OK with no further changes at about 1/2 lb. more. Total approx. 5psi vs 4.5. Could add the oil cooler to be safe.
Not sure whether this is worth considering (looking for a low cost approach if possible) or what increases or problems this might give.
Comments would be appreciated
