As for the exhaust.. there is a replacement end cap available which is made for the KTM 500 EXC that should fit the 501S. My 14 501 had the Euro mapping loaded on before I left the dealer and I have not experienced any overheating. I'm not sure if the 501S fuel map can be altered... Some change the TPS setting to improve the mapping on the KTM 500 EXC which may be applicable to the 501S. edit.. at time of purchase my dealer indicated that the 500 EXC, 500 XCW and the new 501S mapping would be locked. A friend that has the 500 EXC has manipulated the TPS setting to obtain much improved performance along with the end cap exchange.