Oops! I've been using Vaseline for years, can't say I've noticed any perishing or leaks. However I have some silicone lubricant so will use that in future.
Also can't say the exhaust sounds funny, always a good throaty roar when accelerating from 0. However you're right about exhaust fitters, you may need to return to have adjustments made.
[1996 1.6 Punto Cabrio ELX]