Terrafirma Silencer Replacement Pipe This Terrafirma replacement centre pipe fits directly into the exhaust system with no modification needed to the rest of the vehicle. It offers improved performance and an impressive throaty exhaust note. This is a simple replacement and upgrade suitable for 200 TDI Defender 90's from 1990 to 1994. Made from 1.5mm 409 stainless steel, this carries a 10 year guarantee. These are made to considerably outlast the life of the original system. 409 is ideally suited for automotive exhaust systems as its easier to bend and weld, and is not prone to cracking due to vibration unlike other grades of stainless steel. Regarded as a ferratic stainless steel, 409 resists atmospheric and exhaust gas corrosion, but surface rust will form in most .
