Nikolai_V Posted July 15, 2008 Share Posted July 15, 2008 Hey all.. This morning i`d taken my 1978 RR into the local exhaust shop to get a annoying leak fixed. Just recieved a call, saying that the manifolds had been leaking as well, and that when they`d taken them off to resurface them they`d found that they had been welded in the past and were full of cracks - unrepairable... So now I have to get some new (or new to me) manifolds. This is where I need your help. I`ve been told that any RR or discovery manifold can be made to fit (especially as its sitting at a muffler shop). Would there be any advantage in getting say either later model RR or disco manifolds? Obviously Disco 3.5 ones whould fit, but i`m thinking they should flow a bit better (as well as being heaps newer). The price will be comparable (NZD$75-95, about 25-35GBP each), with performance extractors around NZD$600 (GBP200)... So you can see why second hand sounds good. Help!! I have to make a decision soon, as I need the truck for the weekend... Thanks in advance Quote Link to comment Share on other sites More sharing options...
Highway_Star Posted July 15, 2008 Share Posted July 15, 2008 3.9 manifolds from a RaRo/Disco should fit OK. They have several advantages, they flow more gas, and are usually better at sealing to the downpipes. Hoever you'll need to replace your downpipes/y pipe or adapt. A decent exhaust shop shouldn't have a problem doing that though. Quote Link to comment Share on other sites More sharing options...
q-rover Posted July 15, 2008 Share Posted July 15, 2008 I have some 3.9 manifolds sitting around doing nothing. But I don't think that will help you. Quote Link to comment Share on other sites More sharing options...
Nikolai_V Posted July 16, 2008 Author Share Posted July 16, 2008 Thanks for the advice guys, ended up getting the 3.9 Discovery manifold, which will be fitted tomorrow. Would it be naive / hopeful of me to expect some increase in performance with the later model manifolds? Quote Link to comment Share on other sites More sharing options...
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