I don’t know the answer to your question, but I’m running Dave’s kit with fully stock and catted exhaust (so hopefully 225HP +/-) and it’s a blast compared to stock... No comparison at all really. And no regrets! Yes, It’s a lot of money, but 225 vs 250HP probably shouldn’t be what justifies pulling the trigger.Reviving this old thread because it's right in line with questions I have in another thread. Dave says all stock exhaust nets 225hp. What would header and catless exhaust with 2" out the rear get. I know 2.5" is the ticket but already have the 2". Is 250ish in the ballpark? Trying to justify pulling the trigger on the system.
Good luck with whatever decide!