Will this make it quieter?

CheyneX5 · Postby **CheyneX5** » Mon Dec 03, 2012 7:14 pm

Hey Guys,

I installed a new exhaust system today, it consists of a set of 4-1 MazdaSpeed Extractors, Maruha 100 Cell High Flow Cat and a Car Make Corns Cat Back System.

Now I am already aware that this is a recipe for LOUD.

After installing it and a short drive... It sounds great. The only gripe I have is that it drones quite a bit between 3-4k rpm. Everywhere else is ok.

My guess at fixing this with out cutting pipe is to reinstall my 300 cell high flow cat and remove the 100 cell. I know this wont change it dramatically, but will it at least take out some drone?

Cheers.

Postby **NitroDann** » Mon Dec 03, 2012 7:17 pm

Nope, go to a really high end exhaust shop and have the TIG in a nice stainless hotdog.

It will look like it belongs.

Dann

CheyneX5 · Postby **CheyneX5** » Mon Dec 03, 2012 8:08 pm

Thanks Dann,

As mentioned above, I'd rather not modify it as it took a bit to find one in such good nick.

A mate of mine, Johnny has this same cat back fitted to his car with some MaximWorks 4-2-1 headers and a 300 Cell Cat and its not as droney as mine... That's why I asked If that cat would make a difference, as it has more resistance.

Postby **NitroDann** » Mon Dec 03, 2012 8:12 pm

Adding restriction to your performance exhaust?

honestly what is the point?

Dann

CheyneX5 · Postby **CheyneX5** » Mon Dec 03, 2012 8:18 pm

Haha, I know. Seems pointless, but it's not going to be anything major...

I'm happy to do it if it will make it a little more tame. I don't mind if the difference is not massive, but if it will make the drone a little less "droney", then I'm sold on the idea.

manga_blue · Postby **manga_blue** » Mon Dec 03, 2012 11:34 pm

Cheyne, you could try waiting a couple of weeks before you make any changes. Some new exhausts settle down, getting quieter and deeper during the first few drives.

CheyneX5 · Postby **CheyneX5** » Mon Dec 03, 2012 11:34 pm

Anyone else have anything to add to this?

CheyneX5 · Postby **CheyneX5** » Mon Dec 03, 2012 11:35 pm

It's a used exhaust Manga, imported from Japan...

Postby **NitroDann** » Mon Dec 03, 2012 11:36 pm

Consider putting a muffler where the cat goes perhaps?

Dann

manga_blue · Postby **manga_blue** » Mon Dec 03, 2012 11:51 pm

CheyneX5 wrote:It's a used exhaust Manga, imported from Japan...

OK, clearly I got confused when you used the word "new" in the first post.

x2 for the hot dog after the cat idea then.

timk · Postby **timk** » Tue Dec 04, 2012 12:12 am

Changing the cat to a higher flow one on my SE system made a big difference in volume, so I would say yes to the reverse.

project.r.racing · Postby **project.r.racing** » Tue Dec 04, 2012 8:54 am

Yeah it'll change, but it will be a minimal change. You dont hear the droning gone, but it will be less audible. Personal choice would be not to touch it. But it is your car.

bensale · Postby **bensale** » Tue Dec 04, 2012 10:34 am

Yep - change the cat to the 300 CEL one and most of it will go away. I was surprised how much difference a 100 CEL makes and TBH on a 1.6 it shouldn't really effect performance much at all. It's free to swap it back ;)

pcmx5 · Postby **pcmx5** » Tue Dec 04, 2012 11:13 am

Steel cats of that spec are noisy in my experience,much more than ceramic.I agree with the hotdog , say 15 inch but use a perforated one ,have had much better results with sound and quietening using perforated, don't ask why as i don't know.

Getting a good sound and avoiding that drone is the real cahallenge with MX catbacks

Good luck,

Peter