Unleash the full potential of your Vanguard 37 EFI with the Mako 6 Performance Package. Engineered for serious power gains and unmatched reliability, this system transforms your stock engine into a true powerhouse. On our dyno tests, the Mako 6 package has produced up to 17 additional horsepower over stock, giving you the torque and throttle response to power through any load. What’s Included: Neptune EFI fuel controller K&N high-flow air filter BPS Performance cylinder heads; ported, decked, and machined with larger stainless valves BPS “Q” stainless high-flow muffler BPS high-lift cam and tappet valves BPS billet piston rods BPS shaved pistons BPS stainless heavy-duty pushrods BPS roller rockers Mako 6 decal All necessary hardware and gaskets This package is built to deliver reliable, real-world performance; perfect for hunters, haulers, and anyone who demands more from their 37 EFI. Core Charge & Refund Policy Every order includes a $200 refundable core charge. Here’s how it works: Purchase: The $200 refundable core charge is included in the price of the set. Return: You are responsible for shipping your old heads (cores) back to us. Returned heads must be free of cracks and broken bolts. Inspection: Once we receive them, we send the cores out for inspection. This process can take a few weeks. Refund: If the cores are in reusable condition, we’ll refund the full $200. If the cores are not reusable, no refund will be issued and you will be notified. If you’d like them returned, you will be responsible for shipping costs. We explain this policy upfront so there are no surprises, our goal is to make the process smooth and transparent.
