Frogland Posted February 26, 2011 Share Posted February 26, 2011 I finally got around to removing the cat and replacing it with a straight-through pipe.As a result I can feel the turbo spooling earlier and i'm able to go through the the gears more quickly,the only downside is the increase in engine noise,that's why I was wondering whether a replacement down pipe exists with only the silencer ? Quote Link to comment Share on other sites More sharing options...
MONKEYCOPPER Posted February 26, 2011 Share Posted February 26, 2011 is the noise really bad ? i want to do the same and am hopeing that it give an improved exhaust sound. paul Quote Link to comment Share on other sites More sharing options...
lynall Posted February 26, 2011 Share Posted February 26, 2011 I did remove the centre silencer on my old 300tdi disco and the cabin noise was a real pain, so annoying in fact that a couple of weeks later if put the silencer back on. What about one of the small cherry bomb style silencers? Lynall Quote Link to comment Share on other sites More sharing options...
Frogland Posted February 26, 2011 Author Share Posted February 26, 2011 I've only removed the first section,so there are still 2 silencers left the noise level has moved up a notch- it's not unbearable.I've been doing the same trip to work for a year with the def and i know religiously the exact parts ot the road where I change gear,since i replaced the cat i'm moving up gears much sooner it's really weird I'm now going up gradual climbs in 4th instead of 3rd logically I should get improved mpg although it's too early to say yet. Quote Link to comment Share on other sites More sharing options...
rovernut Posted February 27, 2011 Share Posted February 27, 2011 is the noise really bad ? i want to do the same and am hopeing that it give an improved exhaust sound. paul I have removed both CAT and Silencer leaving only the small box at the back end. Along with the already mentioned performance improvements I have a whistle from the turbo and a slightly raspy exhaust note. Has been through MOT since without problem and I actually quite like it. Quote Link to comment Share on other sites More sharing options...
The-Mad-Engineer Posted February 27, 2011 Share Posted February 27, 2011 Hi I had a Def 300tdi which had a cat (the down pipe with a flex section and the cat, and a back box on from that) I removed the Cat / down pipe section and replaced with the Paddocks replacement and found it to be fractionally noiser, but the improvment in 'pick up' and economy outweighed a slight increase in noise . . . . Which gave it a slightly deeper noise which i quite liked TME Quote Link to comment Share on other sites More sharing options...
Frogland Posted March 1, 2011 Author Share Posted March 1, 2011 Yeah right-I would never go back to the original set-up but would like to find a way to reduce the noise level obviously the cat served as a muffler as well,if I used some kind of lagging on the down pipe would it help reduce the noise ? Quote Link to comment Share on other sites More sharing options...
MONKEYCOPPER Posted March 1, 2011 Share Posted March 1, 2011 thanks rovernut, thats the next job , well planned job for me. , bit of rasp and turbo whistle, lovely !! paul Quote Link to comment Share on other sites More sharing options...
ajh Posted March 2, 2011 Share Posted March 2, 2011 Do you mean noise while sitting in the vehicle, or noise while standing behind the vehicle? Quote Link to comment Share on other sites More sharing options...
MONKEYCOPPER Posted March 2, 2011 Share Posted March 2, 2011 Do you mean noise while sitting in the vehicle, or noise while standing behind the vehicle? exhaust sound out the back, mine got a nice turbo whistle and id like to improve on it, plus from what im led to believe removeing cat etc improves driveability. paul Quote Link to comment Share on other sites More sharing options...
Frogland Posted March 2, 2011 Author Share Posted March 2, 2011 Do you mean noise while sitting in the vehicle, or noise while standing behind the vehicle? Noise sitting in the vehicle.Would lagging the downpipe help ? is it possible ? Quote Link to comment Share on other sites More sharing options...
Naks Posted March 2, 2011 Share Posted March 2, 2011 You could always fit a DeGraff-type silencer where the centre box used to be? Quote Link to comment Share on other sites More sharing options...
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