walkerstrider Posted June 8, 2014 Share Posted June 8, 2014 Hi all, if I replace both cats with decat pipes what sort of volume will I be looking at? Already got a 3 inch straight thru cat back fitted. Its a 94 n/a. Many thanks for your input. Quote Link to comment Share on other sites More sharing options...
Graham1984 Posted June 8, 2014 Share Posted June 8, 2014 Loud Quote Link to comment Share on other sites More sharing options...
David P Posted June 8, 2014 Share Posted June 8, 2014 Make your ears bleed loud. Quote Link to comment Share on other sites More sharing options...
Nic Posted June 8, 2014 Share Posted June 8, 2014 It'll be offensively loud with decats and a 3" exhaust. A narrower 2.5" diameter exhaust with a good centre and rear silencer would help quieten it down. Quote Link to comment Share on other sites More sharing options...
Al Massey Posted June 8, 2014 Share Posted June 8, 2014 I was autobahn manifold, double decat 3" straight through pipe and it loud. You could hear me coming a mile away literally. But it wasn't unbearable loud Quote Link to comment Share on other sites More sharing options...
Abz Posted June 8, 2014 Share Posted June 8, 2014 Enough to register on the Richter scale! Quote Link to comment Share on other sites More sharing options...
Kendo11 Posted June 8, 2014 Share Posted June 8, 2014 I have a full decat 94 NA with a 3" exhaust. It is obscenely loud. I love it Do yourself a favour though, have an exhaust bung to hand in case of long journeys/hangovers. Quote Link to comment Share on other sites More sharing options...
trebor69 Posted June 8, 2014 Share Posted June 8, 2014 I too had this for a time but had to change for a quieter one .....and I don't really give a s**t what people think, but was setting car alarms off all the time and pedestrians were covering their ears as I was approaching:D .....don't do it dude ........I do however have a twin silencer system in the "for sale section" at the moment and I ran this with no cats in but took it off as it was too quiet (quieter than standard I'd say).....I now have a whifbitz 1st decat, 2nd cat in place and a 2.5" rear section and it is still very very noisy...... Quote Link to comment Share on other sites More sharing options...
Kendo11 Posted June 8, 2014 Share Posted June 8, 2014 Yes I am all too familiar with the setting off car alarms and scaring pedestrians! Quote Link to comment Share on other sites More sharing options...
Elmo Posted June 9, 2014 Share Posted June 9, 2014 Don't do it, you already have a 3" exhaust and you will notice a drop in performance, if you insist on going double decat make sure the pipes are no bigger than 2.5" all the way through which will mean replacing the exhaust too. Quote Link to comment Share on other sites More sharing options...
skippyboyo1 Posted June 9, 2014 Share Posted June 9, 2014 I've had all sorts of set ups inc 3" from manifold no cats and 1 back box.... It sounded horrible and rasped it's arse off.3" is the wrong bore on an na. Perfect system is race manifold in to 2.5" no cats middle box and back box all day long. Loud but still classy. Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted June 9, 2014 Share Posted June 9, 2014 It was too loud for me in my car... and I was driving behind the decatted NA at the time! I have no idea how anyone lives with it. Quote Link to comment Share on other sites More sharing options...
skippyboyo1 Posted June 9, 2014 Share Posted June 9, 2014 I've had all sorts of set ups inc 3" from manifold no cats and 1 back box.... It sounded horrible and rasped it's arse off.3" is the wrong bore on an na. Perfect system is race manifold in to 2.5" no cats middle box and back box all day long. Loud but still classy. As someone has already said the 3" system was also slow as hell Quote Link to comment Share on other sites More sharing options...
supra_ufo Posted June 9, 2014 Share Posted June 9, 2014 As someone has already said the 3" system was also slow as hell Its an N/A it started life "slow as hell" :d Quote Link to comment Share on other sites More sharing options...
Shane Posted June 9, 2014 Share Posted June 9, 2014 Have just got an NA for the missus that was decatted and had the motoria/ebay exhaust on, it was loud and I like loud. When we first got it started it was blowing all over the place and I put it down to that, but even when I stopped some of the leaks it sounded terrible, really droney and flat. It now has a front decat, second cat back in and ebay 3" and sounds as loud as hell, but a lot lot nicer. Quote Link to comment Share on other sites More sharing options...
Shane Posted June 9, 2014 Share Posted June 9, 2014 Also as a shameless plug in your thread, I have a cheap 3" second decat pipe in the for sale section and you are not that far away from me. Quote Link to comment Share on other sites More sharing options...
walkerstrider Posted June 9, 2014 Author Share Posted June 9, 2014 Cheers guys, think ill keep it as it is! Quote Link to comment Share on other sites More sharing options...
Kendo11 Posted June 9, 2014 Share Posted June 9, 2014 Its an N/A it started life "slow as hell" :d Mines got an induction kit on it though which adds about 100bhp to offset it. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.