Samp Posted 22December, 2022 Report Share Posted 22December, 2022 I have just removed my SSI from my 74-911 s. They 3 tubes are stainless steel and the rest of the material is stew sheet. Does anyone know whether I will get the benefit of the 15% more power or do I require the full SS contraption. Quote Link to comment Share on other sites More sharing options...
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