flirt Posted October 4, 2007 Share Posted October 4, 2007 anyone done this to their z?? if so whats involved, gains etc?? Quote Link to comment Share on other sites More sharing options...
Ian Posted October 4, 2007 Share Posted October 4, 2007 Yup. Didnt really feel any power gains & they are being replaced on saturday. Basically just 2 straight pipes that replace the cats. Noise increased a lot. They would probably make a lot more difference on your TT though Quote Link to comment Share on other sites More sharing options...
bigphil Posted October 4, 2007 Share Posted October 4, 2007 Have a pair of Fujitsubo ones sitting in the workshop, were only on a car for 500 miles ( he crashed the car) almost as new £100 Quote Link to comment Share on other sites More sharing options...
flirt Posted October 4, 2007 Author Share Posted October 4, 2007 phil. can you explain what they are im still learning Quote Link to comment Share on other sites More sharing options...
letank87 Posted October 4, 2007 Share Posted October 4, 2007 Have a pair of Fujitsubo ones sitting in the workshop, were only on a car for 500 miles ( he crashed the car) almost as new £100 If they were hi-flow cats I'd be interested!!! Would rather do without the hassle of decat pipes coming up to MOT time! Quote Link to comment Share on other sites More sharing options...
bigphil Posted October 4, 2007 Share Posted October 4, 2007 phil. can you explain what they are im still learning De-cats are basically a pipe to replace the cats, this removes the restrictive flow in the exhaust, some cars benefit from this and some don't. It does sometimes have a trade off in that it can reduce torque at the lower end. Quote Link to comment Share on other sites More sharing options...
GIXXERUK Posted October 4, 2007 Share Posted October 4, 2007 had a supersprint decat on my previous car, sounded much nicer and with the xxl throttle body it felt quicker but it was a pia swopping every mot Quote Link to comment Share on other sites More sharing options...
Beavis Posted October 4, 2007 Share Posted October 4, 2007 Moved Quote Link to comment Share on other sites More sharing options...
jim Posted October 4, 2007 Share Posted October 4, 2007 phil. can you explain what they are im still learning De-cats are basically a pipe to replace the cats, this removes the restrictive flow in the exhaust, some cars benefit from this and some don't. It does sometimes have a trade off in that it can reduce torque at the lower end. Pardon me for being ignorant or pedantic, but does removing the cats and replacing them with straight pipes not mean that the car is spewing out untreated gases into the atmosphere? If so, you should all be ashamed of yourselves. Also, is it not illegal? Would the car fail the MOT? Quote Link to comment Share on other sites More sharing options...
live2themaxuk Posted October 4, 2007 Share Posted October 4, 2007 phil. can you explain what they are im still learning De-cats are basically a pipe to replace the cats, this removes the restrictive flow in the exhaust, some cars benefit from this and some don't. It does sometimes have a trade off in that it can reduce torque at the lower end. Pardon me for being ignorant or pedantic, but does removing the cats and replacing them with straight pipes not mean that the car is spewing out untreated gases into the atmosphere? If so, you should all be ashamed of yourselves. Also, is it not illegal? Would the car fail the MOT? Quote Link to comment Share on other sites More sharing options...
Ian Posted October 4, 2007 Share Posted October 4, 2007 Pardon me for being ignorant or pedantic, but does removing the cats and replacing them with straight pipes not mean that the car is spewing out untreated gases into the atmosphere? If so, you should all be ashamed of yourselves. Also, is it not illegal? Would the car fail the MOT? Yes, No and Maybe Quote Link to comment Share on other sites More sharing options...
Sarnie Posted October 4, 2007 Share Posted October 4, 2007 phil. can you explain what they are im still learning De-cats are basically a pipe to replace the cats, this removes the restrictive flow in the exhaust, some cars benefit from this and some don't. It does sometimes have a trade off in that it can reduce torque at the lower end. Pardon me for being ignorant or pedantic, but does removing the cats and replacing them with straight pipes not mean that the car is spewing out untreated gases into the atmosphere? If so, you should all be ashamed of yourselves. Also, is it not illegal? Would the car fail the MOT? Mines decatted and would fail the mot but Quote Link to comment Share on other sites More sharing options...
GIXXERUK Posted October 8, 2007 Share Posted October 8, 2007 whats the difference between test pipes and decat pipes or are they the same ? why are they called test pipes ? Quote Link to comment Share on other sites More sharing options...
Ian Posted October 8, 2007 Share Posted October 8, 2007 They are the same thing, I think its just the Americans that call them test pipes Quote Link to comment Share on other sites More sharing options...
GIXXERUK Posted October 8, 2007 Share Posted October 8, 2007 cheers ian, test pipes sounds more exciting Quote Link to comment Share on other sites More sharing options...
Ian Posted October 8, 2007 Share Posted October 8, 2007 I miss my test pipes My car is so much quieter with sport cats on, Its got a completley different sound now - sounded like a jet fighter on the dyno yesterday Quote Link to comment Share on other sites More sharing options...
N15MNO-Daron Posted October 16, 2007 Share Posted October 16, 2007 Dont bother with de-cats, hassle to change over for MOT time and if youre really unlucky traffic cops could stop you and run an emissions test..v unlikely, but if they do then you got uneccessary trouble. Got an offer for V+ plenum and hi flow cats from Kinetix in US for about $950 shipped.. does anyone know where i can get a better deal in UK? All these bolt on bits probably make no difference until youve had a re-map ...hopefully next month will be paying visit to TDi (if i can save enough for it). Quote Link to comment Share on other sites More sharing options...
Ian Posted October 16, 2007 Share Posted October 16, 2007 Dont bother with de-cats, hassle to change over for MOT time and if youre really unlucky traffic cops could stop you and run an emissions test..v unlikely, but if they do then you got uneccessary trouble. Got an offer for V+ plenum and hi flow cats from Kinetix in US for about $950 shipped.. does anyone know where i can get a better deal in UK? All these bolt on bits probably make no difference until youve had a re-map ...hopefully next month will be paying visit to TDi (if i can save enough for it). Try Bigphil or Envy for the Kinetix stuff. Decats are worth the hassle for the noise alone imo. Mine have been removed after my neighbour complained to the police about my car being to loud Quote Link to comment Share on other sites More sharing options...
N15MNO-Daron Posted October 16, 2007 Share Posted October 16, 2007 about the neighbour! Hi flow cats are also nice and loud and legal too! Quote Link to comment Share on other sites More sharing options...
Ian Posted October 16, 2007 Share Posted October 16, 2007 Not as loud as decats though Ive got custom sport cats now and they are nowhere near as loud atleast until I get to 3.5k rpm Gonna get the silencer in the mid pipe replaced soon with a straight pipe so should bring back some of my noise Quote Link to comment Share on other sites More sharing options...
Baptist Posted October 16, 2007 Share Posted October 16, 2007 Flirt, you've got a TT car, so removing the cats will make a massive difference to your car. You will need to get the car remapped though, as the gain setting on the boost paramters will need reducing, to prevent you overboosting. Makes a huge difference to spool time with no cats in the system on a turbo car. Turbo's really dont like cats. Removing them on a N/A car will lose you a fair whack of low end torque. And will be seriously loud. Quote Link to comment Share on other sites More sharing options...
Digsy Posted October 17, 2007 Share Posted October 17, 2007 Flirt, you've got a TT car, so removing the cats will make a massive difference to your car. You will need to get the car remapped though, as the gain setting on the boost paramters will need reducing, to prevent you overboosting. Makes a huge difference to spool time with no cats in the system on a turbo car. Turbo's really dont like cats. Removing them on a N/A car will lose you a fair whack of low end torque. And will be seriously loud. Interesting. I wonder why Alan's so against it? Quote Link to comment Share on other sites More sharing options...
Baptist Posted October 17, 2007 Share Posted October 17, 2007 Maybe he just means dont do it without a retune. Thats the only thing I can think of. Really is nothing but benefits for a turbo car, decreased spool time, lower thermal load, increased mid range torque etc etc. Quote Link to comment Share on other sites More sharing options...
urbanmyth Posted October 17, 2007 Share Posted October 17, 2007 The reason I think he is so against is that when you de cat a TT on standard internals boost control becomes an issue. The turbo is a small units and spools up very quick and over shoots the set boost level and on standard internals over boost (any thing above 8psi) can kill you z. Alan please correct me if I am wrong Quote Link to comment Share on other sites More sharing options...
Baptist Posted October 17, 2007 Share Posted October 17, 2007 I ran my zed with the APS exhaust with the decats, and with the boost setup properly, you wont have any overboost issues at all. Was rock steady. Quote Link to comment Share on other sites More sharing options...
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