Guest DrifterWanaB Posted June 1, 2008 Share Posted June 1, 2008 Ok, used search for this but still not very clear for me Got a couple of q's I have a Standard exhaust, fitting a decat will it liven the noise up a little? Does decatting the N.A give any more/lesspower Also which is the one to do 1st or 2nd decat Thanks people Quote Link to comment Share on other sites More sharing options...
Homer Posted June 1, 2008 Share Posted June 1, 2008 It's been covered dozens of time, but to save you searching: Decat on an NA means quite a bit more noise, it mostly depends on the cat back thats been fitted. I.e stock one will be marginly louder, a 3inch pipe with minimal silencing will be VERY loud. The performance increase will be very small, from what most have said any increase will mostly be in your mind (sounds faster = must be faster) than in reality Quote Link to comment Share on other sites More sharing options...
Dazzi Posted June 1, 2008 Share Posted June 1, 2008 I hollowed out my 1st cat, the sound increase was little to be honest. I didn't notice much power gains either. When flooring it though theres defiantly more of a grunt sound wise. Decatting the 1st cat is probably the best so the 2nd gets you through the MOT. You could double decat but you might need to pop one back in prior to the test date. Quote Link to comment Share on other sites More sharing options...
Rob Posted June 1, 2008 Share Posted June 1, 2008 There is a definite difference in power when I put my 2nd cat back in for MOT, not mind blowing, but it is there. Interestingly, with the 2nd cat in, I can feel a surge come on at 5000rpm, when the variable length plenum butterfly changes, but without the cats it pulls solidly all the way through. Quote Link to comment Share on other sites More sharing options...
Trig Posted June 1, 2008 Share Posted June 1, 2008 gotta say mine is ridiculously loud. but i like it that way! Quote Link to comment Share on other sites More sharing options...
NeoMagic Posted June 1, 2008 Share Posted June 1, 2008 Mine is hideously loud too, I have some 3" system on it with only one box and the first cat. Tbh I hate it, sounds shit, too much buzz like a Honda and raspy as hell. It doesn’t sound like a nice smooth straight size should IMO, I'm contemplating getting a HKS Silent for it in the hope its sounds nice. Quote Link to comment Share on other sites More sharing options...
gordy07 Posted June 1, 2008 Share Posted June 1, 2008 Like the sound of yours trig ive not heard it but i like the spec:thumbs: Quote Link to comment Share on other sites More sharing options...
benkei Posted June 1, 2008 Share Posted June 1, 2008 Baffled decats? Same effect as a decat, but without the extra noise. I had one on my Civic, made a nice exhaust note too. Quote Link to comment Share on other sites More sharing options...
Homer Posted June 1, 2008 Share Posted June 1, 2008 Like the sound of yours trig ive not heard it but i like the spec:thumbs: If Trig still has the RSR then must agree that it sounds superb... and darn loud! Quote Link to comment Share on other sites More sharing options...
gordy07 Posted June 1, 2008 Share Posted June 1, 2008 Nice thats what im looking for Quote Link to comment Share on other sites More sharing options...
Trig Posted June 1, 2008 Share Posted June 1, 2008 Like the sound of yours trig ive not heard it but i like the spec:thumbs: here ya go mate, although this was with both of the cats in http://media.putfile.com/RSR-supra-trig Quote Link to comment Share on other sites More sharing options...
NeoMagic Posted June 1, 2008 Share Posted June 1, 2008 here ya go mate, although this was with both of the cats in http://media.putfile.com/RSR-supra-trig Sounds lovely, how does it sound now though that's the question? Quote Link to comment Share on other sites More sharing options...
Trig Posted June 1, 2008 Share Posted June 1, 2008 Sounds lovely, how does it sound now though that's the question? the same but a lot louder!! ill try and get another vid when ive got the car back Quote Link to comment Share on other sites More sharing options...
NeoMagic Posted June 1, 2008 Share Posted June 1, 2008 the same but a lot louder!! ill try and get another vid when ive got the car back No buzz or rasp at all? Quote Link to comment Share on other sites More sharing options...
SilverSoop Posted June 1, 2008 Share Posted June 1, 2008 I used to have a Blitz nur spec R cat-back system on my old n/a with a 2nd de-cat and as members will tell you, i was quite well known for the exhaust noise lol! But i daren't take the first cat out as my neighbours hate me enough! Quote Link to comment Share on other sites More sharing options...
Trig Posted June 1, 2008 Share Posted June 1, 2008 a bit more rasp when you let off the throttle, ive heard a few pops as well but i think i need new 02 sensors Quote Link to comment Share on other sites More sharing options...
NeoMagic Posted June 1, 2008 Share Posted June 1, 2008 a bit more rasp when you let off the throttle, ive heard a few pops as well but i think i need new 02 sensors Ah see I hate rasp, I want to rid my car of any rasp what so ever. Mine pops like a gooden on the overrun even after replacing the O2's but I have only replaced them with universal one's that don't seem to have fixed my 12 MPG problem anyway. Genuine time me thinks. Quote Link to comment Share on other sites More sharing options...
gordy07 Posted June 1, 2008 Share Posted June 1, 2008 Trig that sounds sweet as mate must be even better with the cats out Quote Link to comment Share on other sites More sharing options...
c7hru Posted June 1, 2008 Share Posted June 1, 2008 I have a HKS Silent Hi Power on my n/a and have just had the second decat done (on Friday), still have my first cat in. IMO it sounds very very nice lol not at all raspy or tinny, am very pleased with it! Quote Link to comment Share on other sites More sharing options...
NeoMagic Posted June 1, 2008 Share Posted June 1, 2008 I have a HKS Silent Hi Power on my n/a and have just had the second decat done (on Friday), still have my first cat in. IMO it sounds very very nice lol not at all raspy or tinny, am very pleased with it! Would love to hear a vid of it mate. Quote Link to comment Share on other sites More sharing options...
c7hru Posted June 1, 2008 Share Posted June 1, 2008 ill try and do one tomorrow and post it up for you Quote Link to comment Share on other sites More sharing options...
NeoMagic Posted June 1, 2008 Share Posted June 1, 2008 Cheers, I will await. Quote Link to comment Share on other sites More sharing options...
supra_aero Posted June 2, 2008 Share Posted June 2, 2008 I have a HKS Silent Hi Power on my n/a and have just had the second decat done (on Friday), still have my first cat in. IMO it sounds very very nice lol not at all raspy or tinny, am very pleased with it! yes, I agree. HKS silent hi power does sound the bizness. Get tons of thumbs up from porsche owners and the like Quote Link to comment Share on other sites More sharing options...
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