I installed an exhaust insert in the Akropovich exhaust on my '03 450. The noise is down but it is still running rich even after I went right to the top clip on the needle. The needle is a NVCQ what is the next leaner needle? The main is a 165 S, is a 160 the next leaner main? The pilot is a 42, is a 40 the next leaner? Thanks guys.