Bull Boost Performance
Performance Radiator Coolant Reroute Kit 1.6L Mazda Miata MX-5 NA NB
Performance Radiator Coolant Reroute Kit 1.6L Mazda Miata MX-5 NA NB
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The Bull Boost Performance system returns the coolant flow path to the correct configuration used before the Miata came along. In addition, the kit retains full functioning of the original system including correct sensor locations for the stock ECU, heater, bypass circuit operation for proper warm-up and cold over-pressure protection.
Attention 01-05 owners: Mazda changed the head gasket design for these years to restrict flow to the #1 cylinder. Not a real fix but it does allow the 01-05 to run a tiny bit cooler than the previous years. Because of this change some people thought the coolant reroute can cause uneven cooling in the cylinder head. Through our experience and testing of this kit on 01-05 Miatas, both on the street and on the track, we have not seen any adverse effects from using this kit on any of the 01-05 cars, and have seen nearly all the cooling benefits experienced on ’90-’00 cars. If you have reason to replace the head gasket on your 01-05 engine, consider using a 94-00 head gasket.
Kit includes everything you need to complete the reroute conversion:
-Reroute adapter
-Remote Thermostat housing
-5/8" hose barb for heater
-195º thermostat
-Front outlet block off plate
- 1.6 has spare 1/8" npt outlet, 1.8 has 2x spare 1/8" npt ports
-36" coil reinforced silicone transfer hose
-Plugs for spare 1/8" npt ports
-All clamps, fasteners, seals needed for installation
Shipping & Returns
Shipping & Returns
Shipping on most orders in 24-48 hours special orders can be 2-3 days. Returns see Returns Policy.
We have a 30-day return policy on most products, which means you have 30 days after receiving your item to request a return. Some products carry a longer manufacture warranty please contact us if you have questions about items.
To be eligible for a return, your item must be in the same condition that you received it, unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
To start a return, you can contact us at overthehilltractor@gmail.com. Please note that returns will need to be sent to the following address: 2005 Stuarts Draft Hwy, Stuarts Draft, VA 24477
If your return is accepted at damage or defective, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.
If your return is due to no longer needed, wrong size order, ordered by mistake, found better pricing, etc the customer is responsible for the return shipping cost.
Any item returned over $50 cost we suggest insurance on package.
You can always contact us for any return question at overthehilltractor@gmail.com.
Damages and issues
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, we can only give 72 hours from time package is scanned delivered to accept claims. Please contact within 72 hours of delivery so that we can evaluate the issue and make it right.
Exceptions / non-returnable items
Certain types of items cannot be returned, like fuel related items due to hazardous materials shipping regulations. We also do not accept returns for hazardous materials, flammable liquids, or gases. Please get in touch if you have questions or concerns about your specific item.
Electrical parts can only be returned if new and in original condition, Used electrical parts are not returnable unless actually defective, contact us with details.
Unfortunately, we cannot accept returns on sale items or gift cards.
Refunds
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method within 10 business days. Please remember it can take some time for your bank or credit card company to process and post the refund too.
If more than 15 business days have passed since we’ve approved your return, please contact us at overthehilltractor@gmail.com.
Most items are covered by 30 day warranty, Fuel Related parts are only covered against actually manufacture defect since the fuel produced today breaks down gaskets and seals quickly. Electrical parts can only be returned if new and in original condition, Used electrical parts are not returnable unless actually defective, contact us with details. Returns are handled on each individual item, some items will not require return for refund just that customer submit picture of proof of issue. Please contact us with questions about returns.

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Free Shipping
Free shipping on orders over $150
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