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You Have $5k To Spend Towards A Truck, How Are You Spending It?

You Have $5k To Spend Towards A Truck, How Are You Spending It?

Diesel Performance Podcast Apr 13, 2026 44 min
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About this episode

The Diesel Performance Podcast tackles a practical “$5k truck upgrade” question, focusing on foundation mods that improve drivability and reliability before chasing big power. They argue for tuning (single engine + trans tune where applicable), plus a lift pump and key fuel-system items like rail pressure relief/sump setups on older Duramaxes. The hosts compare 01–10 Duramax, 03–07 5.9 Cummins, and 17–23 L5P/LML strategies, including injector pigtails and when to upgrade turbos. They also call out misleading marketing claims, emphasizing real-world testing and trans tuning/valve bodies on Cummins.

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Technical Too Afraid to Ask
Term

twin turbo kit

"Nick, you know, our old boss. He, he did this contest, right, for who could sell a twin turbo kit. This is back like 2014."

A “twin turbo kit” adds two turbochargers to the engine. That can help the truck make more power, but it usually takes more work to install and tune correctly.

Part

ball joints

"Fuck, we do your ball joints are on the parking lot, dude. Yeah. Yeah. You know, we've, we've seen some of that."

Ball joints are like pivot points in the front suspension that help the wheels move and steer properly. If they’re worn out, the truck can feel loose or unstable and the tires can wear unevenly.

Term

CP three

"It doesn't have to work as hard and not only does the pump not have to work as hard, CP three doesn't have to work as hard, keep up with the demand."

CP3 is the engine’s high-pressure fuel pump. If the fuel coming in is easier to pull, the CP3 doesn’t have to work as hard to build the pressure the injectors need.

Term

EGT probe

"[791.0s] And the two to the three is a massive jump. [792.9s] No, no, it's definitely the Christmas, the operation of it. [795.8s] Yeah, throw an EGT probe in there as well. [798.2s] Like I think that could round out the dollar amount pretty quick."

An EGT probe measures how hot the exhaust gases are. If EGT gets too high, it can hurt the engine, so it’s a common safety monitor on tuned diesels.

Term

trans

"...it's like, hey, when are you going to do a trans? Oh, when the trans gives me an issue..."

“Trans” just means the transmission. They’re saying some people don’t upgrade it until it starts acting up.

Term

lift pump

"Yeah. You know, little add ons to kind of put into that, you know, like, like we mentioned in the prior truck, like a lift pump, you know, the Rams do have factory lift pumps implemented, but there are updated styles that are going to be less restrictive as you want to grow in power..."

A lift pump is an extra fuel pump that helps feed diesel to the engine. When you make more power, the engine needs more fuel, and the lift pump helps make sure it gets it reliably.

Term

filtration and water separation

"...you want to add the additional filtration and water separation, such as like fast air dogs, stuff like that."

Diesel can pick up dirt and water. Filters and water separators help keep the fuel clean so the engine and fuel system stay healthy.

Term

horsepower

"So, you know, maybe you only want to make 400 or 500 horsepower, maybe a year or two from now, you want to make 650 or 700."

Horsepower is how much power the engine makes. When you plan to build a truck for a certain power level, you also have to upgrade the parts that feed fuel and air so the engine can actually reach that goal.

Term

air intake

"...do a lift pump, add an air intake into the mix."

An air intake helps the engine breathe easier by letting in more air. More air can help the truck make better power when you’re also adding fuel with a tune.

Term

clutch

"...have a six speed manual truck where you just had to buy a clutch."

The clutch is what lets you change gears in a manual. If you make the truck stronger, the clutch may need to be upgraded so it doesn’t slip.

Part

turbocharger

"He goes, well, I want to see how efficient your turbocharger is compared to a competitor who advertises their product and has compressor maps."

A turbocharger is a device that uses exhaust gases to spin a fan that pushes more air into the engine. More air can mean more power, but the turbo has to be matched well to the engine.

Term

compressor map

"That's going to be far more important to you than a compressor map."

A compressor map is like a turbo “performance chart.” It helps predict how the turbo should work, but real-world testing can show what actually happens in an engine.

Term

CP4 pump

"If you were on the forums and you were very scared of a CP4 pump, right?"

CP4 pump is the name of a fuel pump type. Some people worry about it because when it fails, it can cause major damage and expensive repairs.

Term

contamination issue

"it was always a contamination issue. It was always a fuel quality issue."

A contamination issue means debris, water, or other contaminants entering the fuel system. High-pressure pumps are sensitive to this, which is why contamination is repeatedly cited as the cause behind many pump failure stories.

Term

CP4s

"Because that's another one where I've had more injector pigtail issues than CP4s. Again, it's a very different component. But with the horror stories you hear about CP4s"

CP4 is the name of a fuel pump. Some diesel owners have had bad experiences with CP4 pump failures, which is why people talk about replacing or upgrading it.

Term

high flow kits

"...that are going to do tuning on an L five P four of them are doing high flow kits. You know, they're doing an air intake."

High-flow kits are aftermarket components designed to increase airflow (often intake and related piping/filters) beyond stock. On tuned diesel trucks, they’re commonly paired with tuning to better match increased fueling demands.

Concept

stock trucks

"I got customers that are out there with stock trucks. I got customers out there with tune trucks and modification."

A “stock” truck is basically how it left the factory—no performance changes. The speaker is saying that whether a truck is tuned can change how hard the transmission works.

Concept

shift schedule

"And are they the best shift schedule or shift quality and functionality trans? No, there's more refined."

A shift schedule is the programmed pattern that determines when and how the transmission changes gears. It affects shift timing, firmness, and overall drivability. The speaker is comparing shift quality/functionality between transmission options.

Concept

shift quality

"And are they the best shift schedule or shift quality and functionality trans? No, there's more refined."

Shift quality describes how smoothly and consistently a transmission changes gears under different loads. It includes factors like shift timing, firmness, and whether shifts feel controlled rather than jerky. The speaker uses it to judge transmission designs and how tuning affects real-world behavior.

Company

WC Fab

"Chris down at WC Fab, his is stock. There's no tuning or anything."

WC Fab is a shop that works on trucks. They’re mentioned because the person’s truck is stock, meaning it hasn’t been modified with tuning.

Part

valve body hex bolts

"...drop the the trans pan. And there were all the valve body hex bolts. The valve body had swollen so much that it split the valve body in half."

These are the bolts that hold the valve body together. If the valve body warps or swells, the bolts can’t keep everything sealed and aligned.

Company

S&B

"So the S&B had the nice intake kits where they would swap a battery relocation [2368.2s] and move the intake box."

S&B is a company that makes aftermarket truck parts, especially intake systems. Their kits can include extra pieces to make the intake fit and work better.

Term

intake box

"So the S&B had the nice intake kits where they would swap a battery relocation [2368.2s] and move the intake box. [2369.8s] and move the intake box."

The intake box is the housing that holds the air filter and helps route air into the engine. If it’s restrictive, swapping it can help the engine get more air.

Brand

Ford

"And I think out of all these trucks that we're talking about, if we're talking about what's the leading contender, it's Ford. Absolutely. All day long."

They’re saying Ford is the best overall choice in this group, based on how the truck drives day to day and how well it performs.

Term

proper tuning

"Like you get into those and you are not going to be disappointed with proper tuning. I mean, even if you were to get into like the 11 to 16 trucks,"

Proper tuning means setting the truck up the right way so it runs strong without feeling rough or stressing parts. It’s not just “turning it up”—it’s matching the tune to the truck.

Term

drivability

"I'm talking purely from drivability, power delivery, and just functionality, right? Ram, if you're going to compare the Ram, like the Ram's bottom of the barrel from the power delivery,"

Drivability is how nice the truck is to drive day to day. It includes things like how it responds when you accelerate and how smooth it feels.

Term

tuning definitely has the ability to improve

"Tuning definitely has the ability to improve on, but like, you know, you get guys that call in asking about what to buy,"

The host emphasizes that aftermarket tuning can meaningfully improve how a diesel truck drives and performs. This is especially relevant when comparing stock-feel differences between brands, since calibration changes can alter throttle response, torque management, and drivability.

Concept

budget builds

"So I think it's going to be fun to back into some of this stuff a little bit more and actually get into some of those budget builds."

A “budget build” means you’re upgrading a truck without spending a ton of money. The goal is to pick the upgrades that give the biggest improvement for the least cash. They’re talking about doing that kind of plan on these trucks.

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