GrimmSpeed Stealthbox Cold Air IntakeInspiration for the StealthBox Intake came from internal discussions about what we wanted from an intake system for the 2015+ STI. Of course performance is the highest priority, but at GrimmSpeed so much more than that goes into a product. We wanted an intake that purred quietly under normal driving circumstances, but would roar at wide open throttle. We wanted an intake that looked at home in the well-sported 2015+ STI engine bay instead of a shoebox stuffed into the fender area. From here, the SteathBox was born. We took the concept one step further and referenced the F-117 Nighthawk as inspiration for the stealthy look of the GrimmSpeed heat shield. It should come as no surprise that the performance it packs is equally unique.
**Not for sale or street use in CA**
MAF diameter and placement, total bend angle, filter location, and heat shield design were the primary variables during the design phase. To ensure accurate readings, unaffected by the intense heat of the engine bay, MAF sensor placement absolutely must be within the heat shield. To minimize restriction, it was important to keep the total bend angle in the intake tube as low as possible, but still raise the filter location away from the ground to protect it from the elements. Lastly, testing showed the importance of utilizing the factory ram air scoop to feed the otherwise stagnant air in front of the fender.
Each intake begins with a CNC bent and laser cut 6061 Aluminum tube. Contrary to popular belief, particularly from those producing composite intakes, we found that the increased thermal mass of using thicker aluminum tubing (1/8” wall thickness) kept the intake from being vulnerable to rapid temperature change. This is called the ‘thermal flywheel effect’ and will keep the rapidly fluctuating temperatures inside your engine bay from affecting intake temps as drastically. Custom MAF flanges are machined from the same 6061 alloy and are placed on the straight nearest the filter, where we observed the most consistent cross-sectional flow. Mounting brackets are laser cut from 3/16” thick aluminum plate and CNC bent for perfect and repeatable fitment. Finally, heat shields are laser cut, CNC bent and hand assembled before going to powdercoating for a durable wrinkle black finish.
Performance and Tuning
MANUFACTURER PART # 060078
Availability: Item will be ship from their distributor and deliver within 6 business days
2015-2017 Subaru STI only
***Not for sale or street use in California ***
Please inspect your order upon receipt. No damage claims will be honored after 14 days of delivery.
All item we sold come with 60 days defective warranty from the date
We will cover shipping for exchange if we shipped incorrect quantity, incorrect item or defective item
In a case when return is requested, we require the buyer to follow standard RMA procedures by obtaining a RMA number before sending the product back to us.
***Returning an item without following proper procedures will delay the claim process, and we reserve the right to refuse any unauthorized return packages***.
In some occasions we might request images as supporting document for damage/ defective claims to help us determine the best and most effective resolution toward the problem. When this happens, a designated e-mail address will be provided to the buyer so images files can be attached, as the eBay message system does not allow image attachments at the moment.
If you have any questions before buying or after you have purchased the item, please do not hesitate to contact our customer service support team. Our office hours are Monday to Friday 10am-6pm PST , we are off during the weekends and all major holidays and you will be guaranteed that your questions will be replied promptly. Normally we can reply your email within 24hr but if you email to us during weekends, we have to reply to you on the following Monday in the order as it's received. If you have a problem about your shipment, please email us to solve it before leaving a negative feedback.
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