Originally Posted by matty21
spartan has been the leader for a long time and focus primarily on fords , i had it on my o8 and loved it and the service, id say wait for the best, you wont regret anything then
Spartan is a relatively new company, so to say they have been the leader for a long time is incorrect. And on what criteria are you basing your judgment that they are the "best"? Power, ET's, Drivability, price, etc...? Both Spartan and H&S make a great product and to make a blanket statement that either of them is the "best" would be inaccurate. And at the moment neither of them have released a product for the 6.7, but at least we know H&S has the ability to tune them. People are also stating that Spartan only tunes Fords, and while that might be true, it doesn't make their product any better than H&S. In the Cummins world MADS electronics (Smarty) only works on that platform, yet a lot of people like the H&S product better.
To the OP, your best bet is to research as much as you can because people on this forum are very biased toward whatever they own. Spartan guys will tell you buy Spartan and H&S guys will tell you to buy H&S 9 times out of 10.