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EVOMS 981 GT4 / Boxster Spyder EVR450 Performance Package
EVOMS 981 GT4 / Boxster Spyder EVR450 Performance Package

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Our Price: $5,595.00

Product Code: TUN981GT4EVR450

Evolution Motorsport is proud to announce the EVR450 Performance Package for the 2015-2016 Porsche Cayman GT4 and Boxster Spyder!
Since the debut of the original 986 Boxster in 1996, Porsche enthusiasts have relished the driving experience that combined mid-engine predictability to the sharp front end response of a 911--creating an objectively superior chassis platform to the rear engine Porsche flagship. However, to prevent the 'baby Porsche' from impinging on the top-of-the-line 911, the Boxster and later the Cayman were always saddled with smaller, weaker engines, suspension, and brakes from the factory. While the mid-engine cars were a joy to drive, their lesser capabilities meant they were always somehow slower than their rear-engine big brother.

Thankfully, the aftermarket had solutions to these problems. In 2008, Evolution Motorsports debuted the RS350 and RS370 packages for the 987 Boxster and Cayman that used simple bolt-on intake and exhaust upgrades together with EVOMSit software to add more than 50hp to the previously tame 3.4L engine, transforming its performance and elevating the 987 into a giant killer on the track. This same philosophy carried over to the DFI engine in the 987.2, which added the Cayman R and Boxster Spyder to Porsche's line up. With RS370 upgrades installed, Cayman Rs have been seen looming large in the mirrors of early 911 GT3s around the race track for years.

In 2015, Porsche finally announced that they were taking the reins off the Cayman and Boxster by installing the full size 3.8L Carrera S engine behind the driver's seat and fitting the cars with suspension, brakes, and features similar to those typically found on the venerable 991 GT3. The Cayman GT4 and very unique Boxster Spyder were presented. While supremely capable and a tactile joy to experience from the driver's seat, common feedback is that even the larger 385hp 3.8L engine felt down on power, with several dead spots in the middle of the powerband that affect the drive out of corners. With our long history of extracting significant power from earlier Caymans and Boxsters in mind and our technical knowledge of the 3.8L as installed in the 911 Carrera S at hand, we sought to extract more performance from the Cayman GT4 and Boxster Spyder and allow them to achieve their full potential.

The EVR450 performance package is built upon the gains made with the EVR425 performance package, which uses IPD's Competition Plenum and 82mm throttle body to improve intake flow. To take the 3.8L engine beyond the EVT425 power level we turned our attention to its exhaust--in particular, the exhaust manifolds. The stock catback system was found to be free-flowing, lightweight, and has an aggressive sound so we have not pursued development of a replacement system. Since the advent of the 991 and 981 platforms, we have observed that Porsche have dramatically improved the design and construction of their stock exhaust manifolds and catalysts, using hydroformed bends and computer design to build exhaust systems that leave little on the table to improve upon. In testing with short and medium length header with high flow cats, we found only minimal performance gains over stock were possible--an unsatisfactory result for a product that would cost in the neighborhood of $3000-4000 to produce and be put to the test on the track by enthusiast owners.

Not resting on our laurels, we looked outside of the box and began designing a motorsport-focused, catless, equal-length long tube race header together with our partners at Ardent Performance Exhaust. By eliminating the catalyst and utilizing all available space underneath the car, we were able to build a header with much longer primary tubes and and longer collector than stock, and the crown jewel of the EVR450 kit was born. After careful tuning, this substantial design departure from the stock manifolds generated very large gains throughout the powerband, completely eliminating torque dips at 3700 and 4700rpm and giving the EVR450 kit peak gains of more than 50hp over a stock GT4 and 20-25hp more than the EVR425 kit. At no point beyond 3000rpm is power lost compared to the stock manifolds, and engine response and power at low RPM as at least as strong as a stock car. The greatest increase occurs at 4700rpm, where dyno testing shows the car gaining a MASSIVE 58lb-ft and 51hp at the ground compared to stock, completely transforming the performance where it is needed to launch the car out of 2nd and 3rd gear corners.

Launched as a brand in 2017, Ardent Performance has a background of building performance exhaust and headers for everything from high performance street cars and exotics, to indy cars and GT cars, to off road vehicles and snowmobiles for more than 20 years. Handmade from scratch in Phoenix, Arizona, USA from 100% American materials, their Cayman GT4/Boxster Spyder Long Tube Race headers are constructed from 304-series stainless steel with TIG-welded and backpurged construction. Unlike our competitors, we believe a properly constructed and fully welded collector is the proper and more reliable solution for long term, race track-durable header on this platform.

Along with the Ardent Performance long tube race headers, IPD Competition Plenum, and 82mm throttle body, EVOMSit software was developed specifically for the EVR450 hardware to ensure the total package achieves maximum power and crisp throttle response at all engine speeds. Installed over the OBDII port using the included TUNEit Gen 2 flash tool, this software also guarantees no check engine lights will be present due to the modifications. Software is available in 91, 93, and 100 octane (95, 98, and 102 RON) variants, and incorporates Intelligent Tuning's Integrated Switching Technology to safely and automatically adapt ignition timing to deliver the most safe performance for your fuel and conditions. Options such as left foot braking and a raised rev limit are available upon request.

Kit Includes:
  • EVOMSit EVT450 ECU Software
  • EVOMSit TUNEit Gen 2 OBDII Flash Tool
  • IPD Competition Plenum
  • OE 82mm Throttle Body
  • Ardent Performance Long Tube Race Headers

Recommend install time 5hr

Typical lead time is 10-12 business days

Red lines = Stock Cayman GT4 horsepower and torque on 91oct
Blue lines = EVR450-equipped Cayman GT4 horsepower and torque on 91oct

Red lines = Stock Cayman GT4 horsepower and torque on 91oct
Green lines = EVR425-equipped Cayman GT4 horsepower and torque on 91oct
Blue lines = EVR450-equipped Cayman GT4 horsepower and torque on 91oct

Stock GT4 Power: 385hp, 309lb-ft
EVR450 Power, 91oct: 438hp, 343lb-ft
EVR450 Power, 93oct: 448hp, 350lb-ft

Peak Gains AT THE GROUND (divide by 0.909 to estimate flywheel power):
vs stock: +30lb-ft, 48hp
vs EVR425: +8lb-ft, 20hp

At 3500rpm:
vs stock: +55lb-ft, +36hp
vs EVR425: +35lb-ft, 23hp

Unlike our competitors, our headers do not lose power compared to the stock headers around 4000rpm!

At 4700rpm:
vs stock: +58lb-ft, +51hp
vs EVR425: +28lb-ft, +25hp

At 6000rpm:
vs stock: +37lb-ft, +43hp
vs EVR425: +16lb-ft, +19hp

At 6500rpm:
vs stock: +35lb-ft, +44hp
vs EVR425: +12lb-ft, +15hp

At 7200rpm:
vs stock: +36lb-ft, +50hp
vs EVR425: +14lb-ft, +20hp
**Due to using catless race headers, the EVR450 kit is not emissions legal and is sold for off-road motorsports use only**

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