I've installed UD pulleys in a 94 Mustang GT but not in my 05 GT yet.

I was wondering what the negatives would be.

I live in Los Angeles and A/C is a must for about 1/2 of the year. I like my A/C working 100%

I only have a Shaker 500 currently but that doesn't mean I won't get a 2000W Mega-Bass Sound System filling up the entire trunk

So what do you think, install UD pulleys or forget it.