Darkside Posted March 4, 2017 Share Posted March 4, 2017 Hi peeps, going to sound a bit dim here (nothing new I hear you cry) but i cant seem to work out what part of the exhaust gives that raspy sound. I have a Borla on currently and it is a lovely deep throaty sound at high revs but am looking for a generally more raspier sound. I have heard that some people say the Y pipe makes a lot of difference to rasp while others say that a HFC will change it. ive watched loads of youtube varients but cant seem to pinpoint what part i need to change? is there anyone out there that can help or does anyone know of an exhaust specialist i can consult with? Cheers Quote Link to comment Share on other sites More sharing options...
KyleR Posted March 4, 2017 Share Posted March 4, 2017 Decats will cause rasp, HFCs less so. Quote Link to comment Share on other sites More sharing options...
Darkside Posted March 4, 2017 Author Share Posted March 4, 2017 im hearing you, but i dont really want to have to pay to change for the mot twice a year (damn emissions test) Quote Link to comment Share on other sites More sharing options...
G1en Posted March 4, 2017 Share Posted March 4, 2017 I firstly put the cobra cat back exhaust on, was a lovely deep burble ticking over and deep roar moving up the revs, then recently added the cobra HFCs which now introduce a lot of rasp above 4000rpm so i get the best of both. I love it Quote Link to comment Share on other sites More sharing options...
G1en Posted March 4, 2017 Share Posted March 4, 2017 And no issues with mot i will add 1 Quote Link to comment Share on other sites More sharing options...
Darkside Posted March 4, 2017 Author Share Posted March 4, 2017 (edited) does the cobra match the oem ? ie: direct replacement Edited March 4, 2017 by Darkside Quote Link to comment Share on other sites More sharing options...
G1en Posted March 4, 2017 Share Posted March 4, 2017 It doesn't match as such but is a direct replacement if that makes sense. I think the diameter of the st/steel is bigger to allow for a few extra horses and the back box is smaller then you have an option of resonated or not which will add in a mid box. Mines resonated and is still very loud. The y pipe is optional as are de-cats or HFCs. They still connect to existing brackets and mountings though so no fabricating or fudging is required. Speak to Mitz at cougarstore if you need any info. He fitted mine and has fitted loads for members on here. 2 Quote Link to comment Share on other sites More sharing options...
veilside z Posted March 4, 2017 Share Posted March 4, 2017 Removing centre silencer box causes a rasp with cats on or off 1 Quote Link to comment Share on other sites More sharing options...
Darkside Posted March 5, 2017 Author Share Posted March 5, 2017 Is there a replacement pipe for the removal of the mid box or is it a fabrication job? Quote Link to comment Share on other sites More sharing options...
veilside z Posted March 5, 2017 Share Posted March 5, 2017 A new piece of pipe needs to be inserted, slightly longer with a flange to each end. Then weld or exhaust clamp 1 Quote Link to comment Share on other sites More sharing options...
Darkside Posted March 6, 2017 Author Share Posted March 6, 2017 cheers bud Quote Link to comment Share on other sites More sharing options...
davey_83 Posted March 7, 2017 Share Posted March 7, 2017 Size of the silencers can have a direct affect on rasp, i think it sounds horrible like e46 M3's Quote Link to comment Share on other sites More sharing options...
Darkside Posted March 27, 2017 Author Share Posted March 27, 2017 Thanks people, well I took the Z to a custom exhaust centre to have the mid silencers taken out........ Marvelous result, I now have a really nice rasp as well as keeping the deep roar of the borla. Also as a nice bonus, I have a lovely burble and crackling going on Too! Sweeeeet Thanks Veilside for that pearl of wisdom Cheers everyone for their help and input. 2 Quote Link to comment Share on other sites More sharing options...
veilside z Posted March 28, 2017 Share Posted March 28, 2017 Glad to be of help buddy Quote Link to comment Share on other sites More sharing options...
Knight_Templar Posted June 16, 2017 Share Posted June 16, 2017 Hi New to this particular topic..Has anyone got enough time and patience to explain to a complete novice just what is a 1) Burble 2)Crackle 3)Roar 4)Rasp I'm well confused here folks Any advice would be greatly appreciated Ta Steve Quote Link to comment Share on other sites More sharing options...
ASemper Posted June 17, 2017 Share Posted June 17, 2017 1) Burble 2)Crackle 3)Roar 4)Rasp I see these as: 1. Burble is that lovely V6 'wobbly' noise in my opinion, best heard in the lower rpm range. 2. Crackle would be a form of bang on overun, though I would say crackles, pops and bangs all sound different and easier to show irl. 3. Roar is when full throttle, the car comes to life and is shouting. 4. Rasp is, debatably, that horrid lack of tone and 'wasp nest' sort of noise. Eg. A loud civic is often raspy af. 350z's suffer from it when you dont have many resonators/mufflers etc. A straight pipe would be a lot more raspy than say an ark grip Thats my interpretation of them anyway! Sent from my SM-G930F using Tapatalk Quote Link to comment Share on other sites More sharing options...
Darkside Posted July 8, 2017 Author Share Posted July 8, 2017 On 6/17/2017 at 06:28, ASemper said: I see these as: 1. Burble is that lovely V6 'wobbly' noise in my opinion, best heard in the lower rpm range. 2. Crackle would be a form of bang on overun, though I would say crackles, pops and bangs all sound different and easier to show irl. 3. Roar is when full throttle, the car comes to life and is shouting. 4. Rasp is, debatably, that horrid lack of tone and 'wasp nest' sort of noise. Eg. A loud civic is often raspy af. 350z's suffer from it when you dont have many resonators/mufflers etc. A straight pipe would be a lot more raspy than say an ark grip Thats my interpretation of them anyway! Sent from my SM-G930F using Tapatalk Well I have all of the above now, and in just the right amounts of each! I was never wanting my Z to sound like a civic with its guts being ripped out so you are ok there! Quote Link to comment Share on other sites More sharing options...
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