danutt 4 Report post Posted March 6, 2006 please post pros and cons of removing your cat looking to do it this week so would need sum advice really quick how loud? more horses at all?(not looking for major improvements at all better revving? does it affect fuel consumption in sum way?which way? thanx for any helpful info Quote Share this post Link to post Share on other sites
Jazzbass 1 Report post Posted March 6, 2006 I've done it 3 times (3 different cars) and this is what I've found: 1. louder/nicer exhaust note 2. No difference in 0-100 times 3. no difference in revving 4. no difference in fuel consumption Basically, I wasted $100 - $120 each time I did it, if I was expecting any performance difference, but the exhaust tone note alone made up for it. I used a Coby as a replacement. Quote Share this post Link to post Share on other sites
Carl 3 Report post Posted March 6, 2006 Did it to my car, replace cat with two coby resonators, 1 per pipe. Car revved faster Better response Exhaust noise louder Quote Share this post Link to post Share on other sites
Guest Andrew Report post Posted March 6, 2006 replaced totally blocked cat on 525 (m50) improvement in all areas Quote Share this post Link to post Share on other sites
danutt 4 Report post Posted March 6, 2006 still get wof? got an auto so it would drone or would it sound beefy neway? looking to replace it with str8 2.25 piping that a good idea or sumthing else? Quote Share this post Link to post Share on other sites
bravo 35 Report post Posted March 6, 2006 Until they change the law you'll still pass a WOF providing it's not too loud. In previous exhaust threads the generally considered "best" approach is the two coby's with the option of reversing one so yuo get a dual-tone, but a straight pipe would work fine. Quote Share this post Link to post Share on other sites
danutt 4 Report post Posted March 6, 2006 thanx and wat do you mean by dual tone i was thinking a thicker pipe in place of the cat would really help the flow especially with sum headers on the way wat you think? Quote Share this post Link to post Share on other sites
Jazzbass 1 Report post Posted March 7, 2006 Do you mean a thicker-walled pipe or one with a larger bore? thanx and wat do you mean by dual tone i was thinking a thicker pipe in place of the cat would really help the flow especially with sum headers on the way Quote Share this post Link to post Share on other sites
bravo 35 Report post Posted March 7, 2006 If you have a twin exhaust and you put one coby facing one way on one pipe and another facing the other way on the other you get a two-tone exhaust but I just realised you've got a 318 so prob single pipe - so either straight pipe or single coby for sound - should make some improvement. Quote Share this post Link to post Share on other sites
danutt 4 Report post Posted March 7, 2006 thanx for the help and yea a larger bore pipe would that help or should i stick to the same size as the original pipe? Quote Share this post Link to post Share on other sites
Jazzbass 1 Report post Posted March 8, 2006 Same size as original. Large bore for ricies or Holdens. Quote Share this post Link to post Share on other sites
330itis 15 Report post Posted March 9, 2006 I have only 1 coby and a tip.... unfortunately I havent had the pleasure of listening to it or driving it yet... Quote Share this post Link to post Share on other sites
