BY REFERENCE RC RACING
Manufacturers
BY REFERENCE RC RACING
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ET438
New product
Known as the "IRESA silencer", here you will find the RC RACING and438 stainless steel exhaust silencer, manufactured in Spain, for which NSB CONCEPT has been an official distributor since 2009
RC RACING and438 Stainless Steel Exhaust Silencer
The RC RACING and438 silencer, like all other exhausts, has been manufactured in our Spanish workshop since the 1980s.
All components of the RC RACING and438 exhaust silencer are made of 304 stainless steel.
The pipes are available in standard diameters:
- 40mm
- 45mm
- 50mm
- 55mm
- 60mm
The largest diameter is always used to achieve optimal performance before being reduced by hydraulic press to the diameter of your intermediate pipe. Original:

The soundproofing section of the and438 RC RACING stainless steel silencer is made of 4 elements:
- perforated 304 stainless steel tube, 1.6-2mm thick
- steel wool to prevent the soundproofing material from passing through the perforated tube
- soundproofing material molded to the silencer body
- 304 stainless steel silencer body, 1.6mm thick, 90mm outer diameter for Group N and diameter 127mm external diameter for road use

The components of the and438 silencer are MIG welded together (stainless steel wire with gas) on a pedal-driven lathe for consistent welds and significant thickness, guaranteeing the strength of the RC RACING and438 silencer:

The final assembly of the silencer The and438 exhaust is welded onto a Mount such as this and326:

This ensures that 100% of the and438 silencers leaving our workshops are compliant, free of any defects, and fit directly in place of the original.
