Bull Boost Performance
Custom 300 Cell Catted Downpipe Header System for Mercedes‑Benz E63 E63S AMG GT C 4.0TT
Custom 300 Cell Catted Downpipe Header System for Mercedes‑Benz E63 E63S AMG GT C 4.0TT
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Unlock maximum performance from your 4.0L Twin‑Turbo AMG platform with the STRATEC Custom High‑Flow Catted Downpipe & Header System, available in 100‑cell, 200‑cell, or 300‑cell catalytic configurations to match your performance goals.
Engineered for the M177 / M178 4.0TT V8 found in the E63, E63S, AMG GT, and GT‑C models, this system replaces restrictive factory exhaust sections to dramatically improve exhaust flow, turbo efficiency, and throttle response. The optimized header and downpipe design enhances exhaust scavenging, helping deliver stronger mid‑range torque and improved top‑end power.
Precision fabricated from high‑grade stainless steel with mandrel‑bent tubing and TIG‑welded construction, the STRATEC system is built for durability under extreme heat and performance driving conditions.
Catalyst Options
100‑Cell (Race‑Focused)
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Maximum exhaust flow
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Fastest turbo spool
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Loudest, most aggressive exhaust tone
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Intended for high‑performance builds
200‑Cell (Performance Street Setup)
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Significant flow improvement over stock
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Aggressive tone with balanced drivability
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Ideal for tuned street applications
300‑Cell (Refined Performance Upgrade)
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Improved flow while maintaining smoother tone
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Best suited for daily‑driven performance vehicles
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More refined sound profile
Performance Benefits
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Reduced backpressure for improved turbo efficiency
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Faster turbo response
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Increased mid‑range torque and top‑end power
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Enhanced AMG V8 exhaust character
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High‑strength stainless steel construction
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Precision TIG welded fabrication
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Direct bolt‑on installation
Fitment
Mercedes‑Benz E63 AMG W213 – 4.0TT V8
Mercedes‑Benz E63S AMG W213 – 4.0TT V8
Mercedes‑AMG GT – 4.0TT V8
Mercedes‑AMG GT‑C – 4.0TT V8
Model Years 2014–2022
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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