ScienceofSpeed Twin Turbocharger System for NSX


The ScienceofSpeed Twin Turbocharger System is the ultimate forced induction system for the NSX proving that with high performance can include high reliability with factory quality design. Now available as a Tuner kit, or as a complete kit with UEGO's included!

factory quality performance
The system stands alone in design and construction to best represent what we feel is in essence the most factory approach to the design and execution of a turbocharger system for the V6 powered NSX. Unlike single turbocharger systems which merge the twin cylinder banks into one manifold, the ScienceofSpeed Twin Turbo System is designed similar to factory style turbocharger systems for V engines - with one turbocharger per cylinder bank. This allows the turbocharger to be optimally placed as close as possible to the engine's exhaust ports for best transient boost response, reducing the "boost lag" found with other turbocharger systems. In addition, separating the cylinder banks eliminates exhaust reversion seen in merged single turbo systems increasing turbocharger response and decreasing backpressure. The smaller turbochargers are optimized for low and mid range power, yet collectively allow a significant amount of exhaust volume to pass at high RPM to increase top end power yield.

factory quality fitment and reliability
In addition to performance, a significant emphasis was placed on designing a system that does not require permanent modification to the vehicle and emphasizes reliable performance. Positioning of the turbochargers was carefully analyzed to place the turbocharger in an optimal location with custom made thick wall forged stainless steel tubular manifolds while still allowing the turbocharger to fit within the constraints of the factory engine bay. Despite the two separate turbocharger systems, overall complexity has been reduced in comparison to other systems available. The turbochargers mounted above the oil pan eliminates the need to run external scavenge pumps - an important advantage compared to other single turbocharger systems which expose the engine's oil system to reliability of an electric pump. In addition, the turbochargers use reliable internal wastegates which reduce complexity, increase reliability, and promote a quiet livable exhaust sound. The design and layout is stealthy and mostly hidden. The engine bay looks mostly stock with the exception of the aluminum charge pipe - which may be covered for the ultimate sleeper presentation.

no compromise material and craftsmanship quality
An exceptional amount of emphasis was placed on quality to yield not only a fantastic looking system, but also one that is built to last. The turbocharger exhaust manifolds are fabricated from CNC machined stainless steel flanges for a precision fit with forged stainless steel tubular exhaust manifolds that have been designed as support members as well as to provide high velocity exhaust pulses to the turbocharger for maximum performance. The forged stainless steel tubular manifolds allow maximum thermal energy from the engine to transfer to the turbocharger turbines for best throttle response. The exhaust manifolds and turbocharger down pipes are all TIG back-purge gas welded for the most durable high quality construction. Several components have been custom designed by ScienceofSpeed - and the proof is in the details. An example is the custom machined NSX cylinder head adaptor fittings that efficiently feed the turbochargers with oil supply. You do not need to tee into the factory oil housing with fittings that do not fit and chance cracking the housing from vibration like used on other systems.

factory exhaust lay out
In addition to fitting within the factory engine bay - the system is also designed to retain the factory exhaust lay out - bolting directly to the factory catalytic converters (1991-94) or factory style catalytic converters (1995-05, see notes below).

This allows any free-flowing aftermarket exhaust currently installed to be used. Most free-flowing aftermarket exhausts currently available for the NSX can produce up to 450 WHP (over 200 WHP gains from factory). For gains in excess of 200 horsepower, ScienceofSpeed offers a high performance exhaust designed for forced induction use that utilizes free-flowing 3" tubing and mufflers.

a powerfully flexible design
The ScienceofSpeed Twin Turbo System provides the most expandable system available. The system's twin turbochargers can produce up to a 200 horsepower gain on the factory 3.0L or 3.2L engine with no modifications (approximately 470-490 horsepower at the engine) and 300-500+ horsepower gains (approximately 580-900 horsepower at the engine) with built strengthened engines. The use of twin turbochargers allows a significantly wide performance envelope. The system is ideal for a customer with a factory engine with goals of 400 horsepower all the way to a customer who is interested in expanding the factory engine with goals in excess of 900 horsepower!

The use of proven industry standard turbochargers result in a high quality and reliable system with excellent expandable options.

ScienceofSpeed Twin Turbo System for NSX

turbochargers factory 3.0L & 3.2L engines: twin GT25R ball bearing liquid cooled turbochargers
modified 3.0L-3.5L engines: twin GT28RS ball bearing liquid cooled turbochargers
intercooler liquid-air intercooler, bar & plate core, high capacity front-mount heat exchanger
blow off valve TIAL 50mm atmosphere vent
material forged stainless steel pipe exhaust manifolds, stainless steel down pipe assemblies, aluminum charge pipe assemblies, TIG back-purge welded
power capacity 200-450 horsepower gains (200 bhp gain is the recommended limit for the factory engine)
compatibility all NSX years, 91-94 with factory catalytic converters & cat back exhaust (up to 200 bhp gain), 95-05 with 91-94 exhaust parts, or SOS adapter parts/FI exhaust system, 200+ bhp gains requires high flow 3" exhaust system such as the ScienceofSpeed FI Exhaust System, Please see below for more information.
installation notes compatible w/ factory engine cover & brace
charge tube coating wrinkle black powdercoat standard, contact us for custom colors

This product is designed and intended for Racing Competition Only:
This product is not designed or intended for pollution controlled vehicles. In the United States, the use of this product is regulated by the Environmental Protection Agency under the Clean Air Act. Use of this product must be used in accordance with the Clean Air Act, and any other Federal, State, or Local mandated regulations. The use of this product must only be used on a vehicle in sanctioned competition events and may not be used on public roads, streets, or highways. A Vehicle Compliance Waiver is required for all products marked "Racing Competition Only".


  • ScienceofSpeed modified twin GT25R (for factory engines) or GT28RS turbochargers (for modified engines): ball bearing, oil lubricated, water cooled
  • front & rear exhaust manifolds: CNC machined stainless steel flanges, forged stainless steel tubular TIG back-purged welded
  • front & rear turbocharger down pipes with separated wastegate dump tubes: stainless steel tubular TIG back-purged welded
  • liquid-air intercooler, heat exchanger, water pump, and reservoir
  • aluminum TIG welded intake charge tubes (4)
  • twin intake system with AEM Dry-Flow air filters
  • TIAL 50mm vent to atmosphere blow-off valve
  • high quality 4-ply silicone hose couplers, stainless steel smooth band clamps, and all required installation hardware
  • turbocharger water cooling installation kit
  • oil feed & oil drain installation kit with custom dual cylinder head feed fittings
  • 2000-05 NSX: includes additional accessories for retaining the factory air injection system


 tuner system:

Note: All year ranges can be upgraded to Infinity 8 for additional cost.  Must call to upgrade.

upgraded turbochargers:

The ScienceofSpeed Twin Turbocharger System includes either GT2560 (for factory engines) or GT2860 (for low compression engines). Higher capacity turbochargers are available for applications with built engines - call for details.

exhaust system requirements:

  • 1991-94 NSX: Compatible with factory catalytic converters and aftermarket free-flowing exhausts and depending on exhaust, can produce up to 450 WHP. For gains above 450 WHP, ScienceofSpeed offers an exhaust system which will support up to 900 WHP.
  • 1995-2005 NSX: Not compatible with factory catalytic converters. Requires aftermarket barrel style catalytic converters (available separately). Compatible with factory style aftermarket free-flowing exhausts and depending on exhaust, can produce up to 450 WHP. For gains above 450 WHP, ScienceofSpeed offers an exhaust system which will support up to 900 WHP.
ScienceofSpeed Twin Turbocharger System for NSX



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