NC: GReddy Racing Ti-C and header...too loud!!

[bill_viper]

Hello fellas,

I've fitted the GReddy Racing Ti-C muffler (MX5 NC) and tested it with the Racing Beat header and stock midpipe. The sound was extremely loud!! I had to shout to make a conversation with the other person!

1) So my question is, if i'll fit the PPE header which comes with the catalyst and the Racing Beat midpipe with presilencer http://www.good-win-racing.com/Mazda-Pe ... -0069.html the sound level would be acceptable?

2) Also, my thought is because the PPE header don't have the same power gains as the GW/RB header, to balance it with a midpipe with a presilencer and without catalyst.

Thanks,
Bill

[Brian]

Sounds like the most easy choice is just sell the Greddy exhaust and add RoadsterSport Q muffler

But, indeed the PPE header would lower sound level and make most of the gains that you get with full open header (giving up just a little at top of RPMS).

[bill_viper]

Sounds like the most easy choice is just sell the Greddy exhaust and add RoadsterSport Q muffler

But, indeed the PPE header would lower sound level and make most of the gains that you get with full open header (giving up just a little at top of RPMS).

Thanks Brian for your fast reply.

I love the JDM look of the GReddy so i will definitely keep it.

I've seen in your site the PPE header and the Beat Racing midpipe with the presilencer.

My thought of adding the Racing Beat midpipe with the presilencer after PPE's catalyst is right? Because the stock midpipe has a catalyst too, and the PPE comes with a 200 cells catalyst.

So, the combo PPE header and RB midpipe with silencer is sound level acceptable?

[Brian]

Sound level preference is very subjective. What is too loud for somebody else, may be just right for you.

The Racing Beat midpipe will be louder than stock. Stock midpipe has effectively two resonators (because stock converter in the midpipe is also a good resonator). Thus, adding Racing Beat midpipe with just resonator is still taking out one resonator from the system. Therefore, adding PPE header with Racing Beat midpipe to your car is not changing number of resonators/converters and is not likely to lower the sound level much from what you have now. All you are essentially doing with this plan is moving one converter from midpipe to header.

[bill_viper]

Thanks Brian.

[Dubcity]

How much HP does the Greddy exhaust make?

[Dubcity]

Does anyone know of any real HP gain with the greddy exhaust?

[Brian]

Sorry, never seen a dyno of the Greddy. It's a pretty rare sale, might be a dozen or two in the country. That doesn't make for much opportunity to get them on the dyno.

[Dubcity]

I have GWR mid pipe and greddy exhaust without the silencer installed for about two months and like the gain and sound.Two days ago i finally got time to install the GWR header.The sound has increased as expected but is a little too much at around 3-4k rpm.Does putting in the silencer the greddy exhaust came with restrict flow and power in any way or is it just sound?

[Dubcity]

Also found this while researching.Do you guys think the same would apply for the NC?

http://www.importtuner.com/tech/impp_09 ... ower_loss/

[TOPSECRET]

I have the greddy Ti-c also and I purchased and installed a gwr header I still have a stock midpipe. I find it a little loud for everyday driving also. I have put int the silencer and I think on the nc miata the restricted exhaust flow would make it lose power yuo'd have to dyno to confirm. I'm just probably going change the greddy even though I'm very fond of the look. The downside to the greddy is the 60mm pipe diameter which works out to 2 3/8" which isn't a problem if you plan to stay stock midpipe or go with the racing beat but if you go with the gwr it's 2.5 which I think would hamper flow from the ledge that would exist considering it would'nt be a smooth transition from one to another. I'm just going to switch to a goodwin midpipe and a street single power is worth more to me than the look.

[Dubcity]

I really like the look also and the sound was really nice before the header install.it sounds more like a honda now.thinking about the dynoing but that won't be anytime soon.the silencer helps though and some say its mind over matter with the power loss.

[TOPSECRET]

Well I put the silencer in and I say it reduces power quite a bit. It may add some initial torque but after that it chokes it terribly. I'll never be puting it back in I'll deal with the noise until I can get a goodwin midpipe and street single.

[AZ Sun Lover]

Not to rain on the parade, but this muffler in the like below is the quietest performance muffler on the market.
Might not be the lightest or have dual tips but it really drops the sound. Magnaflow says it's because of the dual pass.

http://shop.enthuzacar.com/product.sc?p ... egoryId=10

[TOPSECRET]

Very well could be the quietest but the look is not for me.