am I missing something here i have just fitted a egr bypass valve one i got off ebay. And i am wondering if i could have saved myself £30, the valve was all gunged up but looking at it i was thinking that i could have cleaned it up and just blocked the exhaust bit up with silicone :doh: is there some reason that i could not do this I hope there is now that i have spent£30 on a bypass. no doubt you experts will let me know why i could not just block it up with silicone: