pistonbroke Posted March 7, 2007 Share Posted March 7, 2007 As you can see with my other thread about rattling when cold, my thoughts are leaning towards an exhaust rattle on one of the joints between the rear cat and the start of the HKS Silent, I say this becasue its the most corroded part of the exhaust, the rest of it looks new with no corrosion at all, saying that, its not hanging off or anything, there is just slight corrosion where the batman gasket is between the two pipes. I hypothesis this becasue I'm thinking there is a rattle when cold until the metal expands closing the offending part. My question is, if I put just a rear decat pipe on, providing me with a new seal between my exhaust and the rear of the old rear cat, will I have to use a restrictor ring to keep the boost down ?, bearing in mind it'll still have the front cat in. I have no interest in upping power due to the fact that my car is in daily use and want to keep reliability at its highest and certainly don't want to jeopardise my delicate ceramic jap turbo's. Quote Link to comment Share on other sites More sharing options...
JamesRZ Posted March 7, 2007 Share Posted March 7, 2007 hi was just replying to your previous post, before i start i am a novice! I had the same rattle and it turned out to be a bolt and washer had dropped down between turbos and they engine. I have the HKS Silent exhaust system with twin decats and the rattle started long after i had fit them. To answer your other quesion I i ran it for a while with just one cat on with the HKS zorst and boost never went over 1.2 bar so if you try you would be ok. Sorry cant be more help as i said i am a novice! Quote Link to comment Share on other sites More sharing options...
TrickTT Posted March 7, 2007 Share Posted March 7, 2007 It is possible for the catalyst itself to come loose from its mountings inside the pipe, or start to break up, and rattle inside its box. Hard to say for sure without hearing it, but its unlikly to be a joint unless the exhaust is blowing as well. Quote Link to comment Share on other sites More sharing options...
pistonbroke Posted March 7, 2007 Author Share Posted March 7, 2007 nice one, thanks for your help. JamesRZ, when you ran it with one cat, which one did you still have in, was it the front or the rear one? Quote Link to comment Share on other sites More sharing options...
JamesRZ Posted March 7, 2007 Share Posted March 7, 2007 I had the 2nd one left on mate Quote Link to comment Share on other sites More sharing options...
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