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Frequently Asked Questions

Explore answers to the most frequently asked questions about tuning and performance enhancements for your vehicle.

Questions Specific to 3.7L Engines

What are the best engine bolt-on type mods for the NA Ford V6?

It Depends on what you are building.

If your goal is to increase power over the whole RPM band, and to improve throttle response; here’s what our research has shown to be the best mods. These mods are listed in general order from greatest impact to least:

1. Well-ported lower and a bigger throttle body.
These are listed together because the power change won’t be as significant if you upgrade one and not the other.

These two mods provide your gas-powered NA V6 a better power increase than anything else, hands down, if done well.

2. Sleaker intake hose and a drop filter.

This is usually the first mod done by most; and those who have done it know it doesn’t provide much of a gain. If you do it 2nd, you’ll notice a gain.

3. Headers.

We won’t start a war over long tube v. shorties.

Long tubes seem to be the best; shorties sound good and are easier to install.

4. High-flow CATs.

If you’re driving on the road, we recommend staying legal and keeping your CATs on the car.

They restrict the exhaust more than a straight pipe though.

5. Bigger injectors.

This is a controversial suggestion, though it shouldn’t be. Here’s the short of it:

a. The 3.7 comes with 29lb injectors, which is plenty for the stock engine and another 20-30 HP beyond that.

b. If you modded the 3.7 well, you’ll can use extra fuel capacity in the high rpm range.

c. You’ll need a tune if you get bigger injectors.

6. Tune aka Software upgrade.

This Mod should be listed 2nd, but we’re listing it here for 2 reasons:

a. A tune is not required with the other bolt-on mods, except the injector upgrade.

b. Waiting to get a tune saves money and time.

7. Change your fuel

A tune is required for this change, which is why it’s listed toward the end. It could be listed 2nd or 3rd, depending on what fuel you change to.

8. Drop weight.

Make your car lighter, and performance will improve.

a. Don’t compromise safety by cutting away the frame, etc,. Proceed with caution, as with all these suggestions.

Lowering Rotational Mass is most helpful:

Aluminum driveshaft

Forged wheels

Two-piece rotors

Lightweight flywheel – must be matched with the right clutch.

There’s lots more to be said about each category above. These are just highlights.

Do I need a tune after installing a new intake?

A tune is not necessary when you upgrade with our bolt-on modifications.
For example; the dyno-comparison on our test car, showing the increase in performance after installing our intake upgrade, was done without a custom tune.
We did get a tune with MPT before hitting the Autocross track.
Video footage coming soon.
Spoiler alert – We won!

Will larger injectors improve Horsepower?

No. Not by themselves.
If you modify your engine well, your power potential could outgrow your OEM injectors – for example:
If you port the lower intake properly, and get a larger throttle body; larger injectors will help above the 4,000rpm range.
To reiterate:
-Larger injectors will only help if additional capacity is needed.
-This upgrade won’t help with acceleration or throttle response at lower RPMs.
-A tune will be required if you install larger injectors.

I have a lower intake that was ported by someone else. Will I get a power increase from your adapter and an 80mm throttle body?

Maybe. No promises.
Most shops port their intakes in a way that primarily benefits boosted cars. We focus on NA builds. Our ports are designed to optimize performance for engines that are not boosted.

What makes Viser Performance Intakes unique?

We focus on the needs of an NA build (Naturally Aspirated). Both the shapes and the surface texture of our bolt-on mods are designed to maximize airflow, velocity, and agitation; and to mitigate oscillation in the intake:
Our port design vastly improves low and mid-range power, as well as high end power, when combined with a throttle body upgrade.
Our Throttle Body Adapter is specially surfaced to move air thru the transition with almost no resistance.

These two products are the best bolt-on mods available for the NA Ford V6 (post 2010):

They’ll make your race car much faster than it’s supposed to be, they make your street car much more drivable, and they’ll even improve your gas mileage, if you can keep your gas pedal off the floor.

General Questions

What engine mods would you suggest for an NA 4.0?

Here are the most effective bolt-ons for the 4.0:

–Viser’s Spacer with blades (it works!)

-BBK 70mm Throttle Body

-Long tube headers

-High flow cats and dual exhaust

-Bama tune

-Drop weight, especially rotational mass – forged wheels, aluminum drive shaft, aluminum flywheel, 2-piece rotors, rear seat delete, etc..

Good luck with your build? 4.0s are fun!

If you want to go to the next level with a 4.0, you’d want to talk with a good race mechanic about porting the heads, building a custom intake, changing the cams, rods, and pistons, etc…

Of course if anyone thought about going this crazy with a 4.0, they’d hear the cliche phrases online:

“Just Coyote Swap it.”

“LS swap it”

“4.0s are a truck engine”

I love unusual builds, especially NA builds.

Good luck!

What inspired you to start this little company? Why Ford V6 intake upgrades?

Our founder (Tony) owns and races an S197 V6 Mustang. After doing tons of research, he designed and installed some bolt-on mods for the intake, and they performed much better than expected!

so he decided to share them.

There’s little more to it than that. He wanted to share what he knows to be the best NA bolt-on available to the Ford V6.

Why Ford?

Tony is 6’4” 240. The Mustang is one of few (maybe the only) American Made rear wheel drive cars he can fit in.

That made Mustang an easy choice. Plus they are great cars!

What are the benefits of a high-flow catalytic converter?

High-flow “cats” attempt to maintain emissions standards while improving airflow. If your car is driven on public roads, high-flow cats may keep your car legal.

What is the impact of changing fuel type on performance?

Switching to a higher octane fuel can enhance performance, but a tune is often required to fully realize the benefits, especially if you switch to E85 fuel.

How does dropping weight affect my car's speed?

Reducing vehicle weight improves acceleration, handling, and fuel efficiency, making your car faster and more agile.
It’s a terrific performance mod!

Will a lightweight flywheel improve my car's performance?

A lightweight flywheel reduces rotational mass, allowing for quicker acceleration.

Weight-loss is a great modification, especially a reduction in rotational mass.

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