Charles W Posted February 18, 2004 Share Posted February 18, 2004 I am currently running a Supersport R with a standard road sport exhaust and looking to upgrade. I want to stick to authentic CC parts and was thinking about changing to an R500 type 4-1. However, having read loads of threads there seems to be a debate over whether or not I will need to by a Cat as well (c.£450) in order to get through the MOT (despite having built the car myself). My other concern is the noise level of this system. I want to be able to use it on trackdays and therefore the quieter 7" version my be better, but, my understanding from CC is that you cannot use a Cat with this system which in turn could cause me problems at MOT time. Should I just keep my standard exhaust and save myself a lot of hassle and money?!! Any views greatly appreciated Thanks Charlie Link to comment Share on other sites More sharing options...
simonbell Posted February 18, 2004 Share Posted February 18, 2004 Have you got a cat on your existing exhaust? If so just hang on to your old exhaust and put it on for MOT If not then you shouldn`t need a cat. You only need a cat if the engine would have had a cat in the normal road car of that age..... Not sure what the cutoff date for the K series was. Have engine, diff and tacho.......need car I`ve seen the future.....and it`s powered by duratec Link to comment Share on other sites More sharing options...
Jason Plato Posted February 18, 2004 Share Posted February 18, 2004 What month and year was your car registered ? , and which exhaust do you have at the moment ?. If you have the Roadsport exhaust with the 4-1 outside of the body , then I realy dont think you will benifit from a R500 system . The flow capacity will be greater but this doesnt mean you will make more power without a rolling road re map session . The R500 manifold also exits the body in a different position to the 4-1 competition exhaust so you would have to have a re skin or a big massive hole in the side of the car . If you do wish to consdier an upgrade , then the Superlight R 4-2-1 system would be beificial , and it fits in the existing hole . I have just done this mod , and the midrange did improve . Again you realy need a mapping session to get the best from it . Someone will be along in a moment to confirm which month and year requires a cat ( aug 98 I recall ???) I'm Oct 97 so dont give a stuff 😬 Dave Lotus 7 Club Speed Champion 2003 South Wales Area Organiser C7 TOP Edited by - Dave Jackson on 18 Feb 2004 14:11:16 Link to comment Share on other sites More sharing options...
dino ferrana Posted February 18, 2004 Share Posted February 18, 2004 The R500 system has a seperate catalyst which goes in front of the silencer. It is removeable and can be changed for a section of plain pipe when you MOT test has been done. Link to comment Share on other sites More sharing options...
Charles W Posted February 18, 2004 Author Share Posted February 18, 2004 Its a 2000 EU2 Rover K with a single pipe comming out of the car. I understood the larger 7" quiet exhaust was not compatable with a Cat. Link to comment Share on other sites More sharing options...
dino ferrana Posted February 18, 2004 Share Posted February 18, 2004 Ah the larger one probably isn't. The smaller silencer is. Link to comment Share on other sites More sharing options...
Jason Plato Posted February 18, 2004 Share Posted February 18, 2004 Best bet is a SLR manifold and collector plus cat replacement pipe , and raceco can . or if you wish to run a cat all year round , then a SLR cat and standard silencer . Forget the R500/400/300 exhaust - it wont fit the hole in your body . Lotus 7 Club Speed Champion 2003 South Wales Area Organiser C7 TOP Link to comment Share on other sites More sharing options...
Paul Bowden Posted February 18, 2004 Share Posted February 18, 2004 If Charles currently has a single pipe coming out of the car any upgrade will need a different hole well at least a bigger hole 😳 cut in the side skin Link to comment Share on other sites More sharing options...
Jason Plato Posted February 19, 2004 Share Posted February 19, 2004 Yes , but the larger hole is further forward in the side skin . Ohhh , I give up . Link to comment Share on other sites More sharing options...
Jan T Posted February 19, 2004 Share Posted February 19, 2004 FWIW the 7'' and Cat only fits on the SV. Jan Link to comment Share on other sites More sharing options...
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