Having a lot a smell from cats when accelerating say up to 100 mph or more in my convertible with windows and top up. Is this normal?

 

I have also noticed the same thing. I have a catback exhaust with a resonator delete x-pipe. I assumed mine was due to the ghost cam I was playing with, it probably dumped too much fuel and stopped the cats up?

 

my exhausts are stock but car does have 40000 miles

 

What fuel are you using....some stink more than others??

 

Reg unleaded gas sometimes premium. The smell isn't there under normal driving just when the cats are heated hotter by high speeds

 

That's normal......nothing to worry about!!

 

Mine is so bad, I am installing Kooks headers with high flow cats this week. Never ever, play with a ghost cam....dumped unburned fuel and melted the converters.