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Speed by Design


Ships Direct from Manufacturer


Speed Density Conversion Kit for the R35 GTR. 100% Plug-N-Play.

For those seeking to make more than 700whp (Dynojet) running upgraded turbochargers this is your answer. (Or for those wanting to convert to Vent-to-Atmosphere Blow-Off Valves.)

The factory 5.0 Volt MAF sensors in 3″ aftermarket intake tubing will support roughly 700whp, as which point they are no longer able to meter the increased air volume. Converting to Speed Density Tuning is your answer for higher HP levels than the MAF sensor can support.

This OEM Nissan (Hitachi) Tmap sensor measures Intake Air Temperature and Boost Pressure, all-in-one…relocating your Intake Temperature reading post Intercooler from the factory MAF sensors. This sensor uses factory scaling for a direct PNP install with no tuning changes required.

We offer two version: MAF Delete & MAF is retained.

If you have emissions testing where you live, you’ll need to retain your Mass Air Flow Sensors.

Conversion Plug-N-Play wiring harness makes installation a breeze. This install takes roughly 5 minutes with a single 10mm Metric Socket needed to swap out sensors.

Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the 'Complete Orders' link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.


We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

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