Larini 'LMS' Catalysts (INCONEL)Part No: LA3379LMSCATETA: To Order$13,849


  • CAD Designed & CNC Executed


  • Thermal Insulation

  • Laser Cut Mounting Flanges

  • Laser Cut Mounting Brackets

  • Vent-Matrix Heat Shielding

  • Tig Welded Assembly


  • Precision Engineered For Accurate Fit

  • Larini Systems Warranty

  • No Adverse Environmental Or Technical Implications

  • CNC-Machined Lambda Bosses

  • Original Lambda Probes Retained

  • Unrivalled Lightweight Construction With Durability


  • Improved Low Level Tone

  • Amplified Mid-Range Note

  • Unique, Assertive 'Tone'

  • Volume Increases With Revs

  • Does Not Resonate Or Drone

  • Practical For Regular Use


  • Metallic Internal Cat 'Cores' (Larini Metalith)

  • Parabolic Megaphone Inlet Cone

  • Reversion Pulse Outlet Cone

  • 200 Cells Per Square Inch For Enhanced Flow Rates


  • + Noticeable Bhp Gain Typically

  • + Low/Mid-Range Torque

  • Sharper Throttle Response

  • Significant Weight Reduction> Benefiting Handling & Braking

  • Controlled Temperatures> Aiding Performance Efficiency

  • Modulated Back Pressure Levels> Assisting Engine Performance

  • Vastly Freer Flowing than OE





  • Listed prices exclude VAT (where applicable)

  • Listed prices exclude shipping

FULL INCONEL 625 CONSTRUCTION... Experience counts - on track and on road. Hence, all lightweight catalysts are not designed equally. The quality of construction, testing, and sign-off is critical when using lightweight materials. Due to the elite costs involved, the end user must ask certain questions - Does your designer have a history of working with exotic materials, tested to destruction, in the harshest of environments? Are these systems made and tested on a physical car, or simply 'on the bench'? Check Engine Light status? Warranty status? Is the designer trusted by owners globally, for decades, with only the world's finest Exotic cars to create an elusive and spectacular sound WITHOUT harming performance and durability? What is the credibility of the Thermal Barrier used?

Road/Club Sport/Race... INCONEL 625 Larini 200-cell 'LMS' cats replace the original catalytic converters, and clean emissions while permitting a significant power increase - without any technical or legal issues. The original lambda/heat probes connections are retained in their correct positions for the proper operation of the OBD (On Board Diagnostics) system.

The original vehicle manufacturer catalytic converters typically have 600 cells per square inch (cpsi) each. The FOUR original cats are restrictive in their flow, only allowing an open area of approximately 55%. The TWO Larini ‘Club Sport’ Cats, alternatively, have only 200 cpsi each, an open area of 90%, and offer near unopposed gas flow. The resulting increase in flow rates - with a modulation of backpressure, allowing the engine to 'breathe' and perform better.

Larini ‘Club Sport’ Cats are Euro-5/6+ emissions level rated - returning cleaner emission results than most standard catalysts, making it possible for vehicle tuners to obtain high power gains, whilst meeting government emission levels and staying road-legal with high reliability.

Lightweight construction and a ‘Satina’ effect ensures fit and finish are vastly superior to the bulky original items.

NB: Vehicles registered on or after 1st August 1992, are required to have a fully functioning catalyst fitted in order to comply with U.K. MOT test requirements. (Many other countries have similar requirements).

LARINI components, where supplied in thin wall stainless steel, can be supplied in ultra-lightweight Inconel 625.

Why Inconel?

Inconel 625 is a non-magnetic, corrosion and oxidation-resistant, nickel based alloy.

The main attractions of Inconel 625 to the Formula One™ & Le Mans arenas is in its extremely high tensile strength, with extreme thermo-chemical stability. The mechanical properties of Inconel allow comparatively thinner sections to be used than with other materials, thus reducing weight without compromising strength. Inconel allows for reduced thickness over traditional stainless steel, while strength is actually increased compared to identical amounts of stainless steel.

Example- a typical Inconel 625 exhaust system or manifolds set can be lifted with one's finger tips alone, while matching the strength of a heavier stainless steel equivalent. Inconel's incredible strength to weight ratio (similar to Titanium) allows very thin wall material to be used in construction, whithout risk to structural integrity. This combination results in incredibly light weight components that will not weaken over time.

Inconel alloys are oxidation and corrosion resistant materials well suited for service in extreme environments subjected to pressure and heat. This, combined with good tensile, fatigue, creep, and rupture strength, has resulted in its use in a range of testing applications (liquid fuelled rockets, metal parts for aircraft, aerospace, etc.) with the passage of time.

However, Inconel is extremely expensive as a raw material. Prohibitively so for many manufacturing markets > the key to realistic pricing of the end component will be deciphered by experience of working with the material, thereby saving wastage and labour time. Due to its rarity in mass manufacturing it is not readily available in tube form and must be rolled in-house, thereby further increasing labour costs over stainless steel. The main considerations when using Inconel is the requirement of a highly skilled workforce, state-of-the-art equipment, and the creation of time intensive processes.

Despite the inherent complexities of working with Inconel 625, it is favoured for elite/competition/exhaust/catalyst component manufacture by Larini Systems:

Durability - Inconel's main advantage over Titanium is reduced risk of oxidation of the material through prolonged excessive heat exposure, resulting in brittle components and potential breakages. As such, Inconel is better suited to applications with higher operational temperatures. Inconel's superior durability to extreme heat make it a superior material for Turbocharged and Motorsports applications - which is why Inconel (and not Titanium) is used for F1™, Indycars, Le Mans, NASCAR and many elite formulae.

Experience - Due to its predominant historic use in-house, it is the material Larini Systems are most comfortable with working alongside Stainless Steel for componentry.

Efficiency - In vehicular terms: Importantly the weight typically comes off the front (cats) or rear (muffler) of the car and so has a profound benefit to the balance and all aspects of performance. These components are as close to a Formula One™ system that exists. Utilising type 625 inconel in 0.4mm>0.9mm thickness for tube, silencer casing, & muffler internals typically, and 8mm>10mm inconel for flexible bellows, brackets and flanges typically. (N.B. When vehicle manufacturers ‘market’ certain roadcar exhausts as Inconel or Titanium, it is in fact typically a mix of materials).

Inconel's net inherent weight advantage over stainless steel is in its superior strength, allowing thinner sheet to be used, thereby less material utilised. Hence, the post construction weight saving.

The Larini philosophy is that the sporting vehicle must be super light. The key enemy for vehicle efficiency and dynamics is weight. Performance is not solely a number of horsepower - as power to weight ratio is equally important. Developed via racing, Larini's technologically advanced lightweight designs, unique sounds, and elite constructions, will assist the driver and vehicle to perform in the most demanding of environments. Whilst still satisfying those enjoying their super sports car on a regular basis.

There is no substitute for experience gained through Track & Endurance competition. To sample this please contact Larini.

LARINI - Designed to Win.

** For ultimate thermal management, performance, AND DURABILITY, this exhaust component features custom designed, double layer, INCONEL SUPERALLOY heat shielding technology (with internal performance insulation). Perfected through the racing programme & tested to destruction in the harshest of thermally volatile environments - nothing else on the market will come close!