Posted on Leave a comment

Yamaha Waverunner Factory Audio got your battery down?

Yamaha Waverunner with the battery-killing built in audio

The 2021+ Factory audio systems on Yamaha Waverunners have a known high draw when stored for even short periods. 2 weeks may be all it takes to completely drain the battery if not ridden or put on a trickle charger.

sea doo switch battery is dead after storage
sea doo switch battery is dead after storage

We know it is not practical for everyone to keep their watercraft plugged in when not in use. It can be dangerous if near water and just not something you want to deal with for every ride.

We offer the simplest solution to the problem. The MACSBOOST battery mount cut off switch. This innovative switch mounts directly to your battery without modification. With a twist of your wrist you can instantly disconnect your battery. Walk away with the piece of mind that the next time you want to go ride your watercraft will be ready for fun.

Posted on Leave a comment

Did a dead battery ruin your day on the lake?

The story is all too familiar. You get to the dock on a Sunday. The rest of the family hops on the brand new Sea-Doo Switch Pontoon. You’ve kept it stored safely under cover, nestled away for the winter.

sea doo switch with dead battery

You go to start it and…… crickets. Your battery is dead and you are stuck. Blood pressure starts rising.

sea doo switch battery is dead after storage
sea doo switch battery is dead after storage

You can “try” to jump the battery and hope it doesn’t leave you stranded or you can maybe find a Wal-mart that is open and get a new battery last minute. Your kids are going nuts asking for internet and youtube, the wife is getting thirsty and the invited guests are starting to sweat.

Don’t be that dad.

Be this dad!

Had you installed a MACSBOOST battery mount cut off switch, could have assured that when stored your Sea-Doo Switch would have a charge and be ready for a fun day on the lake.

The MACSBOOST Battery mount cut-off switch requires no permanent modifications. It installs directly to your existing battery cable using the same 10mm wrench you need to change a battery. Best of all you can install this day saving fix in 10 minutes or less.

Dealers are installing this fix on new units as a part of prep. Let us know how we can help your business make your customers happier! [email protected]

Posted on Leave a comment

MACSBOOST Velocity Stack Intakes, Why are they different?

Our intakes take a different approach. We aim for simplicity and performance. Have a look in the highest performance race boats at the races and see what they are running. They usually do not pick parts that slow them down! In real world applications, our intakes are becoming the “go to” solution for the highest performance applications.

Any HVAC expert knows that more hose results in more pressure drop. They also know that 90 degree bends are equally as bad. If air=HP, then why not eliminate as much hose and as many bends as possible?

Any good centrifugal compressor expert knows that the OD of the inlet is extremely sensitive. They also know that the inner part of the inlet does the least amount of work. This is the opposite of most standard throttle body inlets.

Lucky for you, we understand the physics and the science behind what delivers real performance. If you are running any other intake you could be going faster!

Posted on 6 Comments

Yamaha FX,GP1800 & GP1800R Air Intake Modification

The 2021 Yamaha FX, GP1800R are awesome watercraft. They have tons of power in stock form. Fortunately there are some simple and cost effective mods available on Now we get to tell you how to tweak it even further and get the most of your modifications.

MACSBOOST offers the highest performance Yamaha Waverunner intake solution on the market. Racers and rec riders are discovering more rpm with this easy modification.

Many install an aftermarket air intake and get good results and stop. However, an air intake is only as good as the restriction in front of it.

The stock air inlet hoses crisscross and are almost flush when they terminate at the bottom of the hull. This is very bad for airflow as the factory typically leaves little gap. Who knew you had RPM laying in the bottom of your hull? You could just adjust the ends for an airflow improvement but why stop there.

We recommend relocating the hoses from the front of the tank to the rear. The length is already perfect.

Place a single zip tie on the tank strap about supercharger height and pull it snug, then use a large zip tie through the one you just added to the tank strap. Use this as an anchor point to to locate the end of the hose near the air inlet. We recommend to aim the hose down, not at but beside the filter at an angle as shown. Do the same on the opposite side.

Port side intake hose closeup. Notice the location and angle.

With the MACSBOOST hydrophobic intake you do not have to worry about splashes causing trouble. The inner layer is designed to disperse water.

yamaha waverunner gp1800r cold air intake
Port and starboard hose locations and angles around the MACSBOOST hydrophobic velocity stack intake.

The MACSBOOST Yamaha Waverunner velocity stack intake is custom molded to perfectly match the profile of the yamaha SVHO supercharger volute for the ultimate air charger. Our filter flows more air and provides more rpm than no filter at all. Every millimeter of our intake is custom engineered, molded and manufactured for marine performance. You simply can’t do any better. Extra hose or pipes cause pressure drops and rob power. This setup minimizes pressure losses and maximizes flow like no other. There is no better way to feed cool clean air to your waverunner.

We take this innovation a step further by using a large non magnetic stainless steel mesh screen and include a never seen before inner hydrophobic layer. This layer helps deflect splashes without power loss. All other competitors use an outer filter sock that is a restriction and robs power. We’ve seen 100RPM drops adding the socks over typical intake filters.

With the MACSBOOST velocity stack intake you get the best performance possible without compromise. If you are not running a MACSBOOST velocity stack intake you are leaving rpm, power and speed on the table.

While you are at it, check out our Stage 1 kit, which includes the velocity stack intake, the crankcase breather and our best selling ultra high performance MACSBOOST blow off valve as a package deal.

Happy Trails from on our 2021 Yamaha Waverunner GP1800R
Posted on 7 Comments

Why you should install a velocity stack air intake on your Yamaha SHO/SVHO Waverunner

The yamaha Air intake for SHO/SVHO watercraft has always been highly restrictive. The small double right angle S hose was never ideal for allowing airflow. This was always a problem.

Then, in 2019 yamaha changed their supercharger wheels to more efficient models. They made too much power for stock form. Yamaha then modified their air filters to be half the old surface area, greatly reducing power.

Shown below is the highly restrictive 2019+ stock Yamaha Waverunner svho intake filter vs the 2017 stock filter.  Upgrading your intake on 2019+ SVHO will make a huge difference and this is a big reason why!  Yamaha eliminated 50% of the breathing area to cripple your engine.

2019+ Yamaha SVHO Filter
2019 + SVHO air filter with the restrictive smaller element
2018 and earlier SVHO stock yamaha waverunnerintake filter
2018 and earlier SVHO full size
air filter element.

Eliminate all of this an install a MACSBOOST Velocity Stack Air Intake Yamaha Waverunner SHO SVHO and Uni crankcase breather.

To complete your upgrade, dont forget to check our our awesome high performance MACSBOOST blow off valve kit!

Posted on 8 Comments

What’s In a MACSBOOST Honda Aquatrax F12X/R12X Stage 2 Plus Kit?

Perhaps you have already purchased a few items like a MACSBOOST impeller or MACSBOOST module Pro? Want to upgrade to a Stage 2 Plus but are not sure what you need? Here is a list of all the items in the kit. Don’t miss out on the extra performance, extra fun and extra smiles!

17/29 MACSBOOST Impeller & Impeller Tool (only MACSBOOST Includes the tool with every impeller purchase)

MACSBOOST Honda Velocity Stack Intake

MACSBOOST Intercooler Kit


Crankcase Breather

Our Stage 2 Plus kit is easy to install. No special tools required other than the Impeller tool already included in the kit.

In addition to the kit we also recommend the MACSBOOST pump wedge. This reduces drag, gives a drier ride and best off all more speed! This is a must-have on the R, and most F riders like the gains too. The only draw back is if riding 3 up at high speeds it may porpoise more than you would like.

Don’t be the “Captain slow” in your crew!

Posted on Leave a comment

MACSBOOST’s Raising the BAR for Air Intakes on Yamaha Supercharged Watercrafts

What If we told you that you could install an extra 200RPM using a screwdriver and 5 minutes of your time? Would you do it? What if we told you this was the gain OVER an existing “high performance” intake on a stock class race ski?

The 2019 FX-SVHO Test Mule, Specially prepared for stock class racing.

Is it Impossible? Could this be fake news?

Our preliminary testing on a 2019 FX SVHO stock prepared race craft with stock intercooler showed a back to back increase of 9100RPM to 9300RPM going from another high performance intake to our exclusive MACSBOOST Velocity Stack Air Intake. Top speed was a blistering 82.5mph

Obviously, your performance may vary, but the increase could be even more dramatic on more highly modified skis. It should also be noted that a performance tune is required to get the full benefit. Stock tunes often work against high performance modifications such as this.