Discovery+ is the service with something for all. Your favorite genres and brands including HGTV, Food Network, TLC, ID, Animal Planet, Discovery Channel, plus exclusive Originals, all in one place. Whatever you’re into, you’ll find it here.

Discovery Plus

The guys test stepped headers, whose primaries step up in diameter, and merge collectors, which create a restriction in the collector, against good old-fashioned headers.

Engine Masters

Header Science: Step vs. Merge

Diving back into the intricacies of camshaft grinds; exploring not just split-duration cams, but how larger and larger splits affect the power curve.

The Exhaust Duration Equation

The crew tests the second iteration of Holley's throttle body EFI system.

Sniper 2 the Rescue

Freiburger's 582 big-block Chevy returns; shooting out 1050, 1250 and 1450 CFM Dominators; seeing how much difference the extra CFMs make, and how much does the tune change between them.

BIG CFM Shootout

Testing a long-told hose-length theory as well as a long-proven nitrous controller practice to illustrate how softening the hit of the nitrous can help control the power and keep a motor in one piece.

Controlling the Hit

Standalone air/fuel ratio gauges come with a world of tuning possibilities and pitfalls; the guys compare five off-the-shelf units, then show how things like placement, air leaks and dead cylinders can affect readings, tuning decisions and power.

A Study in O2 Sensors and AFR Readings

Whether from exhaust, transmission or any heat-generating components, controlling heat can make a hot ride comfortable, and even a hot intake charge cooler. We test header wraps and panel heat shields, to see how -- and how not -- to keep your cool.

Heat Management

The team has done intake manifold comparisons on nearly every big and small block platform, and at long last, it's big block Ford's turn; shooting out single and dual planes on a street/strip 514ci combo relating to what many BBF guys are running.

BBF Intake Manifold Comparison

The spray-bar style nitrous plate has been the standard forever; the guys put the tried-and-true spray-bar style up against the newfangled perimeter-discharge style.

The Nitrous Plate Debate

Checking to see if pushrods or valve springs affect power production, even when valve float isn't a problem; the crew tests varying combinations of valve spring and pushrod strengths.

Proper Pushrods & Sufficient Springs

The guys have run standard 14-inch round filters in the past and wondered every time if there's any difference between them.

The Surprising Findings of the Air Filter Shootout

Colder fuel makes more power; how to consistently keep fuel temps down, and what difference it really makes.

Keep Your Fuel Cool!!

Watch TV Networks, Shows and Movies | DIRECTV

The latest movies and must watch shows!

Watch Peacemaker exclusively on the HBO Max app, included with an HBO Max subscription.

Data/messaging rates may apply for app download/usage. HBO Max subscription required.

Welcome to your ultimate entertainment destination and the Dexter Universe. Watch new episodes of Dexter Resurrection and more all in one network.

Watch exclusive originals like the new psychological thriller The Institute and Hollywood hit movies.

MGM+ is a trademark of Metro-Goldwyn-Mayer Lion Corp. All copyrights, trademarks, and other intellectual property or proprietary rights are the property of their respective owners.

Watch visionary original series like <b>BMF Season 4, Outlander, Power Book III: Raising Kanan,</b> and much more.

Buckle up for Hollywood hits like Barbie and behind-the-scenes exclusives when you add CINEMAX to your current DIRECTV package. 

Auto parts testing and engine-to-engine shootouts; developed from the popular Engine Masters Challenge and hosted by Steve Dulcich of Engine Masters magazine, David Freiburger of Roadkill, and Steve Brule of Westech Performance Group.

S8 E25 | The Exhaust Duration Equation