Does the tip turn blue and why?
The very tip, the blue part is what is called "heat treated", basically they fry the very tip and turn it blue, this is a property of titanium. Now everyone knows the Ti-C runs hot, so if it reaches a high enough temp it will turn blue, but you can order a new tip from Greddy.
Now I have had this exhaust for about a year, and i do a lot of high way driving, so im at ~3500rpm for an hour, two at times. I have NOT had any problems yet, but highway driving and track driving is totally different. Driving on the highway the engine is at 3.5k rpm but the speed is also ~120-130km/h, lots of wind, cooling properties etc. At the track you are constantly in the 3k-7.5k rpm range and not a lot airflow so if you are going really hard on a hot day there is a possibility of it reaching the high temp and turn blue. But like i said, from everyday driving you have no worries.
Second, as stated before the Ti-C runs hot, and the first versions melted the bumper because it was too close to it. Now there is a version 2 that hangs about 1/2 inch lower and i have had no problems at all again. For the first month i was paranoid and i always checked my bumper for anything after a long drive but nothing. No smells, no discoloration, no melting/warping nothing. (For the first couple days you will smell the exhaust burning in).
