hello, im new to this type of thing. hope someone can settle my mind. i have a 2017 at, current mods are a booster plug and cat removal. i did notice that one exhaust manifold is blue and the other is yellowish. i know metals well and know heat effects etc, however does anyone else notice a similar issue. the pipe that is blue is the shorter cylinder on the right side (if sitting on bike). with the booster plug it should not be running lean whatsoever and since having installed that there have been no issues with backfires or the pop and stall issue. the difference has been there since before the booster plug and the cat mod.