Darren Posted January 16, 2003 Share Posted January 16, 2003 I want to take my front CAT off and have been offered a 2.5inch pipe for my J spec. Is this the right way to go? Or should I fit a 3 inch? Have done a seach but cannot find anything conclusive. Thanks in advance. Darren Link to comment Share on other sites More sharing options...
Terminator Posted January 16, 2003 Share Posted January 16, 2003 What size is the pipe replacing your second cat? Link to comment Share on other sites More sharing options...
Darren Posted January 16, 2003 Author Share Posted January 16, 2003 I think its 2.5inch.....do you think this could limit power/BHP gains? Darren Link to comment Share on other sites More sharing options...
Chris Wilson Posted January 16, 2003 Share Posted January 16, 2003 Originally posted by Darren I want to take my front CAT off and have been offered a 2.5inch pipe for my J spec. Is this the right way to go? Or should I fit a 3 inch? Have done a seach but cannot find anything conclusive. Thanks in advance. Darren 2.5 is plenty big enough, you won't need a 3 inch system until you have much bigger turbos, and I DON'T mean hybrids. If you go to big turbos you will be binning all the stock sequential stuff and turbo outlet plumbng anyway and will need totally different downpipe(s). A complete 2.5 inch system would be fine, but people like the big bore stuff and the makers oblige. Link to comment Share on other sites More sharing options...
Chris Wilson Posted January 16, 2003 Share Posted January 16, 2003 Originally posted by Darren I want to take my front CAT off and have been offered a 2.5inch pipe for my J spec. Is this the right way to go? Or should I fit a 3 inch? Have done a seach but cannot find anything conclusive. Thanks in advance. Darren 2.5 is plenty big enough, you won't need a 3 inch system until you have much bigger turbos, and I DON'T mean hybrids. If you go to big turbos you will be binning all the stock sequential stuff and turbo outlet plumbng anyway and will need totally different downpipe(s). A complete 2.5 inch system would be fine, but people like the big bore stuff and the makers oblige. Link to comment Share on other sites More sharing options...
ChrisR Posted January 16, 2003 Share Posted January 16, 2003 Originally posted by Chris Wilson 2.5 is plenty big enough, you won't need a 3 inch system until you have much bigger turbos, and I DON'T mean hybrids. If you go to big turbos you will be binning all the stock sequential stuff and turbo outlet plumbng anyway and will need totally different downpipe(s). A complete 2.5 inch system would be fine, but people like the big bore stuff and the makers oblige. We heard you the first time! We heard you the first time! We heard you the first time! We heard you the first time! :p :D Link to comment Share on other sites More sharing options...
Chris Wilson Posted January 16, 2003 Share Posted January 16, 2003 Whoops, power failure, didn't think first message had gone Link to comment Share on other sites More sharing options...
Darren Posted January 16, 2003 Author Share Posted January 16, 2003 Thanks Chris. Darren Link to comment Share on other sites More sharing options...
Gaz Walker Posted January 16, 2003 Share Posted January 16, 2003 Originally posted by Chris Wilson Whoops, power failure, didn't think first message had gone Benefits of living out in the sticks eh Chris? Gaz. Link to comment Share on other sites More sharing options...
Chris Wilson Posted January 16, 2003 Share Posted January 16, 2003 Originally posted by gazwalker Benefits of living out in the sticks eh Chris? Gaz. Indeed! I am determined to blow that pesky transformer off it's pole and get them to put in something more "industrial" Link to comment Share on other sites More sharing options...
Ian C Posted January 16, 2003 Share Posted January 16, 2003 What, a Dodge Viper's engine? -Ian Link to comment Share on other sites More sharing options...
kubus1 Posted January 16, 2003 Share Posted January 16, 2003 Guys, I asked the same question not long ago. I was offered a 2.5" system but many people on this forum told me that "its a 3" or nothing" and "better stick with the stock if you are not doing a 3" system" Confused:eek: And... I m booked in for tomorrow for a full decat with a 3" system. Funny. Cheers, Cuba Link to comment Share on other sites More sharing options...
ChrisR Posted January 16, 2003 Share Posted January 16, 2003 Originally posted by kubus1 Guys, I asked the same question not long ago. I was offered a 2.5" system but many people on this forum told me that "its a 3" or nothing" and "better stick with the stock if you are not doing a 3" system" Confused:eek: And... I m booked in for tomorrow for a full decat with a 3" system. Funny. Cheers, Cuba I believe most have 2.5" decat pipes and 3" aftermarket cat back exhausts, that is what i have. Anyone? Link to comment Share on other sites More sharing options...
Alex Posted January 16, 2003 Share Posted January 16, 2003 2x 2.5" Decat pipes + a Super drager for me mean't 1.3bar of boost on average. Bigger Decat pipes would lead to more boost....and you don't want more than 1.3bar on a stock system. Link to comment Share on other sites More sharing options...
kubus1 Posted January 16, 2003 Share Posted January 16, 2003 Alex, What BHP do you see with a 1.3bar? Cuba Link to comment Share on other sites More sharing options...
Alex Posted January 16, 2003 Share Posted January 16, 2003 Originally posted by kubus1 Alex, What BHP do you see with a 1.3bar? Cuba I shall be able to tell you soon.... Link to comment Share on other sites More sharing options...
kubus1 Posted January 17, 2003 Share Posted January 17, 2003 Having my exhasut done tomorrow, Can't wait. When I had it done on my last car (only a 2.0 16v megane coupe) it made a great difference. Will let you know tomorrow how I got on! Cheers Cuba Link to comment Share on other sites More sharing options...
Thorin Posted January 17, 2003 Share Posted January 17, 2003 Originally posted by kubus1 Having my exhasut done tomorrow, Can't wait. When I had it done on my last car (only a 2.0 16v megane coupe) it made a great difference. Will let you know tomorrow how I got on! Cheers Cuba We await the ":D" when you finally run out of petrol driving it around and return home Link to comment Share on other sites More sharing options...
kubus1 Posted January 17, 2003 Share Posted January 17, 2003 Happy, happy... :p But, they said they couldnt remove the first cat for some reasons. So I ve still got one left, the car seems so much more responsive and quicker. One thing that puzzles me is that I boost lower then on the stock system. Any ideas? Cuba:) Link to comment Share on other sites More sharing options...
Terminator Posted January 17, 2003 Share Posted January 17, 2003 Originally posted by kubus1 Happy, happy... :p But, they said they couldnt remove the first cat for some reasons. So I ve still got one left, the car seems so much more responsive and quicker. One thing that puzzles me is that I boost lower then on the stock system. Any ideas? Cuba:) What, removing a cat raises boost, what have they done taken the cat out and stuffed in a dog. Link to comment Share on other sites More sharing options...
Alex Posted January 17, 2003 Share Posted January 17, 2003 Originally posted by kubus1 Happy, happy... :p But, they said they couldnt remove the first cat for some reasons. So I ve still got one left, the car seems so much more responsive and quicker. One thing that puzzles me is that I boost lower then on the stock system. Any ideas? Cuba:) The ONLY way IMO that is possible is if the new pipe is MORE restrictive. Link to comment Share on other sites More sharing options...
Chris Wilson Posted January 17, 2003 Share Posted January 17, 2003 Originally posted by kubus1 Happy, happy... :p But, they said they couldnt remove the first cat for some reasons. So I ve still got one left, the car seems so much more responsive and quicker. One thing that puzzles me is that I boost lower then on the stock system. Any ideas? Cuba:) You mean they TRIED to remove the first cat and failed, or they couldn't supply a first cat replacement pipe? As the 1st cat is by far the more restrictive it should be a priority to have this removed too. I can achieve what others failde to do.... Link to comment Share on other sites More sharing options...
Matt Harwood Posted January 17, 2003 Share Posted January 17, 2003 Originally posted by Chris Wilson I can achieve what others failde to do.... Only 'cause we keep giving you cars to practice on Go on Cuba, take the car to Chris and he'll increase your grin for you Link to comment Share on other sites More sharing options...
Chris Wilson Posted January 17, 2003 Share Posted January 17, 2003 Originally posted by Matt Harwood Only 'cause we keep giving you cars to practice on Go on Cuba, take the car to Chris and he'll increase your grin for you Thankfully I fit CAT bypass pipes better than I type Link to comment Share on other sites More sharing options...
Alex Posted January 18, 2003 Share Posted January 18, 2003 Originally posted by kubus1 Alex, What BHP do you see with a 1.3bar? Cuba 393.6BHP @ 6017rpm according to my figures. About 345BHP @ the wheels 352.1LBFT @ 5330rpm. All done with a peak of 18.5psi...running a bit lean at the top end. Link to comment Share on other sites More sharing options...
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