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

Some know valve float as the evil that lurks beyond the redline, the dreaded robber of horsepower and destroyer of valves; taking a look at the valve float.

Engine Masters

A Crash Course in Valve Float

The General Mayhem 440 is strapped on the dyno and decisions on which intake and headers to run, as well as how to squeeze out more than the 707 Hellcat horsepowers, are made.

General Mayhem 440 Returns

The guys perform what may be the first ever back-to-back comparison of factory-oriented pistons against reverse-oriented pistons.

The Piston Pin Offset Flip -- Is It a Flop?

Testing intake upgrades for a street car swap; pitting the factory manifold against a worked-up aftermarket piece.

5.9 Magnum Intake Shootout

A look at the differences between single and split-duration camshafts.

The Split Duration Decision

Using a basic 150-horse plate system, the crew demonstrates the basics on installation, safety and tuning for a typical carbureted engine.

Nitrous for Noobs - The 150 Shot Walkthrough

Trying to find the least restrictive way to route a cold air system.

Cold Air Considerations

The guys explore the cooling benefits of water-methanol injection.

Water-Meth Injection: Is It Cooler Than the Intercooler??

The guys study the fueling demands, horsepower, and the pros and cons of running different types of fuel.

Choosing Fuel: Which Barrel is Right for You?

The crew dives into the waters of individual runner systems, shows how to tune them, and whether all that cool makes any more power than the stalwart carburetor.

Hilborn Stacks!

It's a battle of price vs. power for street-centric wedge cylinder heads.

The Wedge Head Shootout!!

The crew tries to find the right balance of decibel levels and performance.

Exhaust for Turbos - The Dos and Dont's

Watch TV Networks, Shows and Movies | DIRECTV

The latest movies and must watch shows!

Watch It Welcome to Derry 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. Watch new episodes of Jeremy Renner in the new season of Mayor of Kingstown and more all in one network.

Watch exclusive originals like the adventure drama Robin Hood 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 Power Book IV: Force, Outlander: Blood of My Blood, BMF, The Couple Next Door and much more.

Watch Hollywood hits like Civil War 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.

S6 E26 | A Crash Course in Valve Float

E26 | A Crash Course in Valve Float

E25 | General Mayhem 440 Returns

E24 | The Piston Pin Offset Flip -- Is It a Flop?

E23 | 5.9 Magnum Intake Shootout

E22 | The Split Duration Decision

E21 | Nitrous for Noobs - The 150 Shot Walkthrough

E20 | Cold Air Considerations

E19 | Water-Meth Injection: Is It Cooler Than the Intercooler??

E18 | Choosing Fuel: Which Barrel is Right for You?

E17 | Hilborn Stacks!

E16 | The Wedge Head Shootout!!

E15 | Exhaust for Turbos - The Dos and Dont's