200sx-Starlet-Jay Posted February 18, 2008 Share Posted February 18, 2008 hi all, just thinkin of a cheap performance mod to do over weekend! has anyone done a diy decat on there n/a... if so how easy and what is needed??i cant remember what it looks like under me car, but if its like my 96 celica, it was away from the flexi joint. so i assume a peice of slightly oversized pipe, a few exhaust clamps, and some exhaust sealant may do the trick?! i know its a bit ghetto lol but ive started a collage corse so my wallet is a bit thinner than usual until i start an onsite placement and get some more muller!! Quote Link to post Share on other sites
RobSR Posted February 19, 2008 Share Posted February 19, 2008 well firstly, the catalyst in the n/a's are not bolt out they are one piece, so firstly, you would have to cut the old on out, and then replace the gap with a piece of pipe...when the garage did it on my SR with just clamps and sealant, it had a massive air leak, so they then welded it in (not the best idea as a cat needs to be in for the MOT) even after they welded it up, the Bee*R blew it apart anyway....secondaly, if you just cut the cat out on a stock system with stock pipework you will get the Bumble Bee Rasp sound that is horrible...So what i would do is, get a full custom exhaust made up, with a bolt in bolt out cat/decat, so have the cat in for the MOT, pass that, and then swap it over vice versa Rob Quote Link to post Share on other sites
Tintin_SR Posted February 19, 2008 Share Posted February 19, 2008 hi all, just thinkin of a cheap performance mod to do over weekend! has anyone done a diy decat on there n/a... if so how easy and what is needed??i cant remember what it looks like under me car, but if its like my 96 celica, it was away from the flexi joint. so i assume a peice of slightly oversized pipe, a few exhaust clamps, and some exhaust sealant may do the trick?! i know its a bit ghetto lol but ive started a collage corse so my wallet is a bit thinner than usual until i start an onsite placement and get some more muller!!i did it bud but using "oversized pipe, a few exhaust clamps, and some exhaust " wont work all that well i used a bit of oversized pipe then welded it in its the best way Quote Link to post Share on other sites
200sx-Starlet-Jay Posted February 19, 2008 Author Share Posted February 19, 2008 i did it bud but using "oversized pipe, a few exhaust clamps, and some exhaust " wont work all that well i used a bit of oversized pipe then welded it in its the best waycool. well i know a welder so he cud hopefuly do it for me!! did you notice a power gain or anything by doing it??? Quote Link to post Share on other sites
200sx-Starlet-Jay Posted February 19, 2008 Author Share Posted February 19, 2008 well firstly, the catalyst in the n/a's are not bolt out they are one piece, so firstly, you would have to cut the old on out, and then replace the gap with a piece of pipe...when the garage did it on my SR with just clamps and sealant, it had a massive air leak, so they then welded it in (not the best idea as a cat needs to be in for the MOT) even after they welded it up, the Bee*R blew it apart anyway....secondaly, if you just cut the cat out on a stock system with stock pipework you will get the Bumble Bee Rasp sound that is horrible...So what i would do is, get a full custom exhaust made up, with a bolt in bolt out cat/decat, so have the cat in for the MOT, pass that, and then swap it over vice versa Robi had the bolt in bolt out decat on my celica, and it still made that rasp noise i hated it!! when cat was in it was fine tho! so what causes that noise? it sounded like a wet fart when it hit powerband lol Quote Link to post Share on other sites
RobSR Posted February 19, 2008 Share Posted February 19, 2008 i think its to do with the diameter of the stock pipe work...if it was larger it would be okay....Rob Quote Link to post Share on other sites
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