I am running the 626R from Brenspeed. They also installed 1-7/8" long tube headers, an X-pipe and mufflers. Custom dyno tune, which they graciously allowed me to observe from a safe distance. Talk to George as others have suggested. I live in New Orleans and drove all the way to Dallas to get the work done. Zero regrets. Shop was spotless, they do great work and they know what they're doing. I've put about 5000 miles on it since the install. Zero problems. That's no guarantee for you of course, but I wouldn't leave the HP on the table. Go with the 626R. PS: Mine is a 2014 and I only had about 1500 miles on it when I had it done.