Do I really need new plugs with a smaller pulley?

[Joes 2003 SVT]

I just ordered a smaller pulley and a pulley removal tool and I was wondering do I really need a set of new plugs to go along with this?

 

[Catmonkey]

Depends on resulting boost pressure. If you're under 12 psi, you'd be okay with the stock plugs. If you're higher you probably need to go to a colder heat range.

 

[Joes 2003 SVT]

Ok cool thanks Catmonkey