would a duramax gmc sierra with a PPE chip would be faster than a gt2 or a f430?
No, it's a pickup it doesn't have the traction in any circumstance to keep up. You can replace the rear suspension to try to get it hook up but there still isn't enough weight back there, you put weight back there and it's heavy as hell. I'm assuming you saw one of those dumb youtube videos where they have a ridiculous car beat a sports car a 1/4 mile? Little secret, 90% of those are B.S.
Looking for a Used Sierra in your area?
CarGurus has 31 nationwide Sierra listings and the tools to find you a great deal.
Search GMC Sierra Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
GMC Sierra Experts