Engine Masters - X vs H vs Straight Exhaust

I haven't watched the video, but peak numbers are not the important factor in most applications. It's the "area under the curve" that affects acceleration. Even if a combo is down on "peak" HP and/or torque by a sizable amount, it can be out-accelerated by one with less peak but a "fatter" curve. Also, a few HP through the range may not sound like much, but it does add up.

I tested X-pipes & Dynomax mufflers on my car 10+ years ago and it was beneficial, even before I took the 60+ lbs of weight out from elsewhere in the car to bring it back down to "race" weight.. I forgot the numbers, but they were good enough to where I kept it on the car despite the pain of having to drop the exhaust on the rare occasions I had to pull the engine or trans. But it does only involve the 6 collector bolts and 2 hanger nuts towards the back. I had Dynomax UltraFlo mufflers at the rear end but went to their "bullet" style for more clearance around the center section with no obvious performance difference. It's all TTI stuff, including their 1 5/8"-1 3/4" step headers.

I kinda like the quieter tone & I hear more of what's going on. But it did scare me initially because I heard noises I never heard before over open headers. I get lots of compliments too. The X-pipes & mufflers are also on my 360 Aspen wagon for NHRA. I just have to get it back together after getting water in the engine.

As many have said, each combo is different and your results may vary. Just gotta try it. But reading & listening to a variety of sources, opinions & results can help you make an "educated" decision.

Almost forgot.....After having dialed in the carb over the years, my particular combo did want a little less jet after the exhaust was installed, which I figured out later.