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- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 991.1 GT3 3.8L (475 Bhp) 2014-16
- Porsche 991.1 GT3 RS 4.0L (500 Bhp) 2015-16
- Porsche 991.2 GT3 4.0L (500 Bhp) / GT3 RS 4.0L (520 Bhp) 2017-19
Fits:
Porsche 997.1 GT3 3.6L 2007>>
Porsche 997.2 GT3 3.8L 2010>>
Porsche 991 (911) GT3 2014>>
Porsche 991 (911) GT3 RS 2014>>
Akrapovič's Slip-On Line represents the first step in the exhaust system tuning process and the muffler can easily be installed onto the Porsche GT3's original system. Built from hi-grade titanium and finished with two eye-catching double round tailpipes, this entry system makes the GT3 more powerful and lighter, and gives the car that unique Akrapovič sound. Designed to make the car stand out from the crowd and increase its appeal even more, the visual delight of the Akrapovič Slip-On can be further enhanced with the addition of an optional carbon- fibre rear diffuser. Beautifully handcrafted from the finest materials and designed to enrich the exclusive look of the titanium exhaust system, the diffuser is a must-have extra for any discerning owner.
TECHNICAL DATA
* measured with: Porsche 911 GT3 RS (991) 2014
Maximum power:
- kW: plus 4.5 at 7800 rpm
- HP (m): plus 6.1 at 7800 rpm
- HP (i): plus 6 at 7800 rpm
Maximum torque:
- Nm: plus 4.9 at 8100 rpm
- lb-ft: plus 3.6 at 8100 rpm
Weight:
- minus 1.1 kg / 2.4 lb
*** Mandatory Extra Part Required
Tail pipe set (Titanium) - part no TP-PO991RS/H/T
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
MTP-PO997GT3H
The product you are viewing cross references to these numbers
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
Rear silencer and catalytic converters
Fits
Porsche 987 Gen 2 Boxster 2.9Ltr
Porsche 987 Gen 2 Boxster S 3.4Ltr
Porsche 987 Gen 2 Cayman 2.9Ltr
Porsche 987 Gen 2 Cayman S 3.4Ltr
RACETRACK USE ONLY
These components are designed and developed for racetrack use and to maximise the car's performance. They are not street legal and must be installed by professionals in the sector
SOUND - TUBI SOUND
Tubi Sound is the standard sound of Tubi Style exhausts, louder and more powerful than the original sound. This sound represents our brand
EXHAUST VALVE - NO VALVE
The exhaust system does not include a valve and always guarantees the most impressive sound. If the standard system includes one, control of the valve by both the engine ECU and by the pilot via the specific control systems is no longer possible
SYSYEM FINISH - POLISHED
Mirror finishes are highly reflective and created by polishing the stainless steel. The polishing process enhances appearance and consistency, making cleaning easier. A special rolling procedure is used. It is essential to remove deep scratches as any surface defects will be very noticeable on the finished product. it improves corrosion resistance. The polishing eradicates crevices where corrosive particles can lodge themselves
END TIPS NUMBER AND POSITION - 2 CENTRAL
The end tips emerge from the centre
MATERIAL - AISI 304 STAINLESS STEEL
A choice stainless steel ideal for aggressive environments where combustion emissions can cause serious chemical corrosion on other types of metal
MAIN PIPE DIMENSION 50mm
This is the diameter of the main pipe of the exhaust system
Please note: sports catalytic converters or bypass pipes do have type approval and may not be legally installed on vehicles manufactured after 1st March 2001. They can not be used on a public road and are not MOT compliant, they are designed for race and track cars only.
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
Fits:
Porsche 987.2 Boxster / Boxster S - 2009 to 2012
Porsche 987.2 Cayman / Cayman S - 2009 to 2012
9m 987.2 Titanium Non-Valved Silencer
- Constructed from Aerospace grade TC4 titanium precision welded with a lifetime guarantee
- Weighing in at 9kg in total with a weight saving of 7kg over the stock silencer(16kg)
- Direct bolt on installation
- X-pipe style with either black tips or silver
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9M98711311731
The product you are viewing cross references to these numbers
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
Ninemeister 9m Sports Valved Stainless Steel Silencer
Transform the sound and character of your Porsche with the Ninemeister 9m Sports Valved Stainless Steel Silencer. This premium performance exhaust system allows you to choose between refined everyday driving and an exhilarating sports exhaust note at the touch of a button, giving you complete control over your driving experience.
Fits:
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
Manufactured from premium 304-grade stainless steel using precision welding techniques, the Ninemeister 9m valved silencer combines exceptional durability, OE-quality fitment and a lifetime guarantee. Featuring an efficient X-pipe design, it improves exhaust gas flow, enhances throttle response and produces a deeper, richer sports car soundtrack without compromising everyday drivability.
Designed as a true direct replacement for the factory muffler, installation requires no cutting, welding or permanent modifications, making it an ideal upgrade for owners looking to improve both sound and performance while retaining factory reliability.
Available with a choice of black or polished silver exhaust tips, allowing you to tailor the appearance of your Porsche to suit your personal style.
What Does the Ninemeister Sports Valved Silencer Do?
The Ninemeister valved silencer replaces the restrictive factory rear muffler with a high-flow stainless steel performance exhaust system featuring an integrated exhaust valve.
At the touch of a button you can select between:
- Refined, quieter driving for everyday use.
- A deeper, more aggressive sports exhaust note.
- Enhanced engine character throughout the rev range.
- Improved throttle response.
- Freer flowing exhaust gas delivery.
- A more engaging Porsche driving experience.
The integrated X-pipe balances exhaust pulses between both cylinder banks, producing a smoother exhaust flow and a more distinctive flat-six soundtrack.
Why Upgrade to the Ninemeister Sports Valved Silencer?
The standard Porsche exhaust is designed to satisfy global noise regulations and broad customer requirements. While refined, many enthusiasts prefer a more engaging soundtrack and improved engine response.
Upgrading offers numerous benefits including:
- Switchable exhaust sound at the push of a button.
- Richer flat-six exhaust note.
- Improved throttle response.
- Reduced exhaust restriction.
- Premium 304 stainless steel construction.
- Lifetime guarantee.
- Direct bolt-on installation.
- No cutting or welding required.
- Maintains emissions compliance.
- Does not trigger the Check Engine Light.
- Choice of black or polished silver tailpipes.
- OE-quality fit and finish.
It is the ideal upgrade for drivers wanting increased character without sacrificing everyday usability.
Performance Benefits
The Ninemeister 9m valved exhaust provides:
- Noticeably improved sports car sound.
- Faster engine response.
- Improved exhaust gas scavenging via the X-pipe design.
- Reduced exhaust back pressure.
- Smooth power delivery.
- Enhanced driver engagement.
- Factory-style fitment and reliability.
The result is a more exciting Porsche that remains perfectly suited to everyday road driving.
Premium Construction
Every Ninemeister silencer features:
- Precision welded 304-grade stainless steel.
- Corrosion-resistant construction.
- High-quality internal valving mechanism.
- OE-quality mounting points.
- Lifetime guarantee.
- Direct replacement design.
- Choice of black or polished silver exhaust tips.
Designed to provide years of reliable performance in all driving conditions.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9M98711351131
The product you are viewing cross references to these numbers