New from Torque Developments International Plc, an HKS Super Turbo Muffler stainless steel exhaust system for the FD3S version of the Mazda RX-7. Featuring HKS’s unique ‘Slit Tip’ sound control technology and a 3 inch (74.7mm) main pipe diameter with no restrictions throughout to deliver optimum power response, whilst keeping noise at a sensible level. Unique to HKS, the inner slit shape of tailpipe produces an enhanced silencer effect and it was designed with inspiration from an owl’s wing.

HKS engineers noted that Owls fly practically silently, aided by the notch shapes of their wing tips that releases air to prevent drag and eliminate noise. HKS has adopted the same approach for its Super Turbo Muffler. Research showed that by analysing the sound levels and frequency both inside and outside the RX-7’s cabin, the slits inside the tailpipe of the HKS backbox reduced noise by approximately 2dB.

In addition, the low frequency ‘droning’ resonance noise was reduced to improve comfort for everyday driving. The Super Turbo Muffler incorporates HKS’s renowned attention to detail and high quality construction, including the following technical features:

•  Low back pressure with quiet sound levels
•  Suitable for all Mazda RX-7’s from standard power levels to highly tuned cars with large turbochargers
•  Low sound levels for comfortable street driving
•  During acceleration the distinct sound of the engine is highlighted

The HKS Super Turbo Muffler for the FD3S Mazda RX-7 is available now from Torque Developments International Plc, priced at £615.00 excluding VAT. To buy this product now, please click on: