egrossi Posted February 10, 2007 Share Posted February 10, 2007 Could you guys help, Not sure which way to go I've got the box but the rest of the exhaust is under JASMA (JAP noise restriction) . Might go with a new pipe from cat to back box or do I go all the way (full de-cat) reason for asking would love to know what the difference in sound is like from cat back to a full de-cat This question is being asked only for noise reasons as quite where I live and she is started at 5am in the mornings and worried I might be waking the whole street up [sHOCK][/sHOCK] Link to comment Share on other sites More sharing options...
uk-rich Posted February 10, 2007 Share Posted February 10, 2007 i understand that N/A's are incredibly loud after de-cat Link to comment Share on other sites More sharing options...
Todd Posted February 10, 2007 Share Posted February 10, 2007 i understand that N/A's are incredibly loud after de-cat Mines wasn't but I only had one cat removed (rear). Link to comment Share on other sites More sharing options...
egrossi Posted February 10, 2007 Author Share Posted February 10, 2007 She's only got one cat and thats up the front, I suppose there is'nt a video anywhere that anyone knows of or I may have to tap supragreg up. Link to comment Share on other sites More sharing options...
egrossi Posted February 10, 2007 Author Share Posted February 10, 2007 thanks for the reply guys but you experts out there anything please. Link to comment Share on other sites More sharing options...
Oly Posted February 10, 2007 Share Posted February 10, 2007 change the spoiler? Link to comment Share on other sites More sharing options...
Matt _Aero top_ Posted February 10, 2007 Share Posted February 10, 2007 I got a N/A with a HKS supper dragger cat back and at certain rev ranges it is LOUD , But i'm also wanting to at least remove the second cat but don't want it to be any louder . If i'm honest i'd like it abit quiter so i was toying with the idea of having a second de-cat pipe but chopping it and welding in a small slim silencer ( obviously get someone like powerflow do do this ) Link to comment Share on other sites More sharing options...
Faye Posted February 11, 2007 Share Posted February 11, 2007 Fully decatted NA's with after market exhausts are very, very loud. Consider the fact the NA idles very high on a cold start - you'll end up with very grumpy neightbours if you keep starting her up at 5am! Link to comment Share on other sites More sharing options...
CJ Posted February 11, 2007 Share Posted February 11, 2007 Fully decatted NA's with after market exhausts are very, very loud. Consider the fact the NA idles very high on a cold start - you'll end up with very grumpy neightbours if you keep starting her up at 5am! Faye, did you fully decat yours or leave one cat in? Link to comment Share on other sites More sharing options...
Faye Posted February 11, 2007 Share Posted February 11, 2007 Nope, done the whole lot Link to comment Share on other sites More sharing options...
Guest carlsupra Posted February 11, 2007 Share Posted February 11, 2007 i have just had both the cats taken out of mine and is is a conciderable amount louder. however have noticed a difference in performance, a lot more reponsive. i do have one or two grumpy neighbours thuogh. Link to comment Share on other sites More sharing options...
CJ Posted February 11, 2007 Share Posted February 11, 2007 Nope, done the whole lot Was there much of a difference in performance? And is there the same problem with emissions as a TT come MOT time? Link to comment Share on other sites More sharing options...
Faye Posted February 11, 2007 Share Posted February 11, 2007 I went straight from catback exhaust to double decat and noticed a good improvement in performance, the car seemed to pull better. Nothing like a TT in terms of gain for mod but worth doing none the less. When it comes to MOTs, yes same problem with emissions and a further one, mine failed for being too loud, and that was with one cat in. Took it to another station and no problem, so thats just down to a pernickety tester as its a discretionary fail. Link to comment Share on other sites More sharing options...
CJ Posted February 11, 2007 Share Posted February 11, 2007 I went straight from catback exhaust to double decat and noticed a good improvement in performance, the car seemed to pull better. Nothing like a TT in terms of gain for mod but worth doing none the less. When it comes to MOTs, yes same problem with emissions and a further one, mine failed for being too loud, and that was with one cat in. Took it to another station and no problem, so thats just down to a pernickety tester as its a discretionary fail. Thanks Faye I have acquired an NA and was thinking of keeping it as mine for a while hence the questions. TBH, I am not after the blistering pace anymore (been there done that eh? ) but still want the looks. Link to comment Share on other sites More sharing options...
Faye Posted February 11, 2007 Share Posted February 11, 2007 No problem, noisy NA's are a specialist subject Good looks they can do and you might actually find the NA more fun to throw around too, I know I do Link to comment Share on other sites More sharing options...
Dave Posted February 11, 2007 Share Posted February 11, 2007 I got both cats out and she sounds sweet on full loud pedal but quiet on the mway .it just depends what back box you have fitted. as for performance its more responsive and gives you about 5-8 bhp Link to comment Share on other sites More sharing options...
Trig Posted February 11, 2007 Share Posted February 11, 2007 Got the second decat in and i have a first decat but not sure if im putting it on yet..... Link to comment Share on other sites More sharing options...
Dave Posted February 11, 2007 Share Posted February 11, 2007 Got the second decat in and i have a first decat but not sure if im putting it on yet..... do it if you dont like it put the cat back Link to comment Share on other sites More sharing options...
Trig Posted February 11, 2007 Share Posted February 11, 2007 its not that I may have my NA-T kit in the next month and the manifold replaces the first cat anyway Link to comment Share on other sites More sharing options...
Max Headroom Posted February 11, 2007 Share Posted February 11, 2007 I have the rsr with 2nd decat on my NA, its not loud until you put your foot to the floor and it ROARS like a good un!! If you want to ring me I can start the car up and you can listen if you want Link to comment Share on other sites More sharing options...
egrossi Posted February 12, 2007 Author Share Posted February 12, 2007 Well many thanks to Max Headroom spoke to him last night and will be going to take one cat out as thats the sound I'm after. As full de-cat will be to loud and could do without grumpy neighbours at 5am when she starts roaring. Many Thanks Chaps Big shout to Max, Diamond geezer. Link to comment Share on other sites More sharing options...
blitz supra Posted February 12, 2007 Share Posted February 12, 2007 i understand that N/A's are incredibly loud after de-cat think faye has total de cat, really loud if totally decat a NA poss not road legal maybe ?? total decat on a TT is ok as the turbo acts as a silencer, Link to comment Share on other sites More sharing options...
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