I ran my car yesterday at a race with the toda header/70mm HFC/T1R 70em exhaust setup and it was 89-90DB at 60 feet!

 

Thanks for the info!

I'm in NC, and really want not to annoy neighboring folks next to our autocross venues, so staying near 90-93db is an important goal. Good to see that both are in that range, or lower. Drone is a Second priority issue since I have to drive 1.5-2 hours to all of our sites, and I think I am not very drone-sensitive. Sound quality matters very little if at all. I haven't heard from anyone who has fabbed an exhaust as to whether it made power or not, but most say they are below SCCA sound limits, which is good. Plus all the DIY ones weigh in at less than the 24-27# the T1R and EVS weigh.

@iluvketchup....did you dyno yours?

 

Dyno tuned both (70em on track car & 70ssp on STR car). But numbers are irrelevant & it's hard to say that the deltas came from the exhaust alone.

 

Let me know what you come up with! I have a Ti-C and am looking to fabricate some sort of turn down for emergencies only (i.e. for those events where they're using the sound meter improperly). I was thinking about making something that replaces the tip that comes with it...i.e. making a turn down with the 3 holes for the allen screws that hold the existing tip on.

Is that 92 dB at 50 feet? If so that's a really low limit. My K&N FIPK/PLM Header/Berk 70mm cat/Ti-C is usually 93-94 dB at 50 ft, but sometimes it's a little louder depending on how they're measuring. And at Devens they do 93 dB at 100 ft and I actually just barely failed that somehow (think it was one of those times they had the meter in a really bad place). The silencer doesn't help much with peak sound - I put the silencer in and went from 93 dB to 92.5. The silencer just takes out drone mostly.

But I'd guess a turndown will do it for you even if it's 50 ft....shouldn't need one of those fancy schmancy ones with the baffles. Turndowns do a much better job than the silencer will.

 

I don't agree that numbers are irrelevant, but can be useful if placed in proper context. And I assumed you had done intake, HFC and ECU tune to go along with the exhaust. Does your comment mean results for both were similar, or was each exhaust dyno'ed at different times with different mods on different dynamometers, therefore the results are confounded?

 

Uhh tell me about it. There is apparently one neighbor who complains all the time... I love people that move next to an AIRPORT and then complain about noise... let alone autox noise when the airplanes taking off end up being much louder than our cars ever are.

I will definitely let you know what I end up doing. Someone pointed out to me that vibrant makes some universal silencers but I do want to experiment with a turn down first in the hopes that I dont have to kill performance.

 

My experience with Vibrant is that they don't reduce noise a whole lot. They're very nice pieces, but it seems that other options muffle sound a lot more for a given muffler size.

I put a large oval Street Performance muffler at the end of my DIY exhaust instead of the turndown - it's just a tiny bit quieter than the turndown. It sure weighs more though!

 

My apologies for cross-posting, but have you guys had any issues with header fitment near the engine mount? https://www.s2ki.com/s2000/topic/105...-engine-mount/

2006 AP2
Intake: K&N FIPK (for now)
Header: 2000*F ceramic coated J's Racing SPL.Ex.Mani
Mid-pipe: Berk 70MM HFC
Cat-back: T1R 70R-EM single
Sound: 92-94db at 2013 Sun Belt Tour

With a stock header, stock mid-pipe, and 70R-EM the car droned on the freeway and during deceleration. No dyno measurements when the cat-back was added. VTEC engagement was verified on the dyno to be limited to 5500 RPM.

Adding the Berk HFC eliminated all drone. No dyno measurements when the HFC was added, but it did destabilize AFR in the mid-range. I was able to drop VTEC from 5500 to 3650 with measureable gains on the dyno primarily near VTEC engagement.

Adding the J's manifold didn't affect sound, subjectively, but I can hear the exhaust valves more. I'm in the process of tuning the manifold. The one pull I've done so far showed .5AFR leaner in the mid-range, but it is suspicious.

As a little side note, the T1R 70R-EM is NOT directly compatible with the Gendron rear bar. I think I mentioned this elsewhere, but you must relocate one of the hangers away from the bearing mount.

 

No clearance issue here with the PLM.

 

No clearance issue here with the PLM.