Looks right, but make sure you don't overtighten the T-Clamp. I had breakages due to my mistake of overtightening the clamp. I believe he recommends 110-120 in/lbs on those t-clamps.
Deans exhaust performed well at Thunderhill East. Quick to rev off the bottom if not a bit flat up top (The Drummer will bounce the limiter if you let it). Could be a tuning issue. This will be my pipe of choice for Sonoma.
Also, the spacer included depends on how it's mounted. Some require it, others don't. It's dependant on the header mounting and how it's lined up. Most of the time the spacer is used.