Originally Posted by Anguslamb
Emm... but it might make heat accumulation which impact the engine performance at last, especially in tropical region. For me in HK, I'd even remove the engine cover for better heat lost.
Yeah, for hot climates, this would potentially be a big mistake. BMW removed underhood insulation on nearly all N54 cars and I believe most N55 cars continue not to have it. I would much rather have a cooler engine than slight noise decrease.
Even with the extra oil cooler, the N55 runs hot in TX summers and with long oil change intervals, adding even more heat is not a good plan.