Does this diffuser require any modification to the factory front bumper?

No. It installs by replacing the genuine lip spoiler and is designed to fit the CBA-R35 factory bumper directly. No cutting, drilling, or permanent modification to the bumper is required. Fitment is limited to the factory front bumper; the part is not designed to work with aftermarket bumper setups.

At what speeds does the front downforce benefit become noticeable?

Top Secret describes the stability improvement as most relevant at medium to high speeds, which on the R35 corresponds to the range where the stock front end starts to generate lift and the car becomes less predictable under throttle. The exact threshold depends on the car's overall setup, but the diffuser is designed to address the behavior that shows up during circuit use and fast road driving rather than low-speed conditions.

Do the brake cooling ducts replace the need for dedicated brake air guides?

They complement rather than replace dedicated brake cooling. The integrated ducts in this diffuser route some airflow toward the front brakes as part of the diffuser's overall function. Dedicated brake air guides like the Top Secret carbon kevlar units are a more focused solution for high-load circuit use where brake temperatures are a primary concern. Running both together gives the most complete brake cooling setup.

Description

Additional Info

Shipping policy

BP PRICING DIFFERENCE

Reviews

Product Inquiry

Description

Top Secret Carbon Front Diffuser w/ Skid Plates for CBA-R35 Nissan GT-R

The Top Secret front diffuser GT-R owners on the pre-facelift CBA-R35 need to address front-end stability at medium to high speeds replaces the factory lip spoiler with a full carbon unit that actively manages airflow from the lower lip through to the body rather than letting it separate and generate lift. The stock lip does not streamline underbody airflow in any meaningful way; this diffuser does, capturing moving air and converting it into consistent front downforce that keeps the nose planted in the speed ranges where the R35 starts to become sensitive. Integrated brake cooling ducts work alongside the aerodynamic function, routing air toward the front brakes to help stabilize brake performance during hard driving.

Features

Replaces the factory lip spoiler with a full carbon front diffuser
Streamlines airflow from the lower lip to the body
Provides consistent front downforce
Integrated brake cooling ducts for improved brake performance stability
Improves front-end stability at medium-high speeds
Full carbon construction
Direct replacement for factory lip spoiler, no cutting required

Applications

Nissan GT-R: CBA-R35 | 2008-2011

Notes

This diffuser is compatible with the genuine factory front bumper only
All Top Secret carbon is delivered in its raw state and will require prep and application of a UV resistant clear coat and/or PPF

Frequently Asked Questions

Does this diffuser require any modification to the factory front bumper? No. It installs by replacing the genuine lip spoiler and is designed to fit the CBA-R35 factory bumper directly. No cutting, drilling, or permanent modification to the bumper is required. Fitment is limited to the factory front bumper; the part is not designed to work with aftermarket bumper setups.
At what speeds does the front downforce benefit become noticeable? Top Secret describes the stability improvement as most relevant at medium to high speeds, which on the R35 corresponds to the range where the stock front end starts to generate lift and the car becomes less predictable under throttle. The exact threshold depends on the car’s overall setup, but the diffuser is designed to address the behavior that shows up during circuit use and fast road driving rather than low-speed conditions.
Do the brake cooling ducts replace the need for dedicated brake air guides? They complement rather than replace dedicated brake cooling. The integrated ducts in this diffuser route some airflow toward the front brakes as part of the diffuser’s overall function. Dedicated brake air guides like the Top Secret carbon kevlar units are a more focused solution for high-load circuit use where brake temperatures are a primary concern. Running both together gives the most complete brake cooling setup.

About Top Secret

Top Secret Co., Ltd. (株式会社トップシークレット, Kabushiki-gaisha Toppu Shīkuretto) is a renowned Japanese automobile tuner and parts manufacturer, founded by automotive engineer and driver Kazuhiko “Smokey” Nagata. The company is widely recognized for its expertise in tuning, aftermarket parts, body kits, and performance engineering. Top Secret’s product range includes aero components, exterior and interior parts, engine upgrades, exhaust systems, chassis, brakes, suspension, and powertrain enhancements. In addition to its products, Top Secret is also famous for its high-speed Wangan runs, as well as its involvement in professional drifting, circuit racing, and drag racing.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

Reviews

Product Inquiry

First Name (*required)

Last Name (*required)

Your E-Mail (*required)

Telephone Number (*required)

Country (*required)

Vehicle Year / Make / Model (*required)

Please Explain What do you want to do with your vehicle

Additional Information (optional)

I agree to the terms & conditions and privacy policy and to have Bulletproof Automotive LLC contact me for promotion, marketing and other purposes via email, phone or SMS message.