hi all,

so i have a remapped car, full decat etc and a 5" jap-slash cut exhaust.

now, i personally like the noise, yeah its a bit loud, but i like the flat four sound.

problem is, i have two young children both under 2 & when i do take them out, i am concerned about the cabin drone on their sensitive ears.

i dont really fancy fitting a bung as they can really **** up performance, can you guys reccomend an easy back box to change for so there is still some noise, but a little less drone, also, really dont want to sacrifice any performance, so dont fancy adding back on the stock kit.

any advice welcome cheers

and before anyone suggests - the wife wont let me put any protective ear wear on the kids - although it would look pretty funny!!

 

Fit a 3 inch milltek people seem to get good bhp with those and are reported as not to loud

 

For the start, you could put resonated center pipe back on and see what will happen, there will be a lot less drone but still deep rumble. Performance won't suffer.
Or some Apexi ECV valve could also be interesting solution.

 

3" tornado on my classic. Loud on full chat and gives that lovely burble and best of all, no drone at cruising speed.
Got it from 'scoobyparts.com'.

 

5" exhaust! - now each to their own and all that.
But really, whats the point?

 

Might be worth popping along to a local meet and see what others are running and what fits the bill for you.

 

I think he is refering to the backbox tailpipe being a 5' slash cut ,cant imagine he has a 5 inch straight through system lol ,i would hear him coming in coventry.

 

If its less drone you want and you just want to change the backbox imho get a ninja 2,quite bassy but far less drone .I had one for 6 months and have an old folks home opposite me and i never used the bung once,cant say the same for the afterburner vortex i have now though .There may be a couple of vids on youtube for ninja 2 ,have a look see what you think.Mine cost me £55 used :

 

I know its not 5" completely

However, a stupidly loud backbox with a stupidly big exit looks ridiculous, and to me seems completely pointless.

 

Cobra Track Day system SB04 is great. Very quiet, and I've not noticed any loss in performance.

 

Thanks guys lots of brands to google and see what's what. I bought the car like this! Didn't put it on myself, I prefer a 3" exit, like a milltek, but I have a full system and it cost nearly a grand on my last car. So what's the best option just backbox? Would prefer a bit smaller and not another bakedbean can!

 

I would look for 2nd hand back box or as said previously a resonated centre section would cost about £300ish

 

I have Miltek on mine and its quiet. Backbox pipe size is also rather modest. But the full system is 3" pipework all the way through.

Another option is the revolution 3" exhaust. Again, nice and quiet but doesn't constrain performance.

 

My recent experience may be of use.

I ran my 05 Sti PPP with an aftermarket exhaust (not sure of make - 4.5" straight cut exit) that came on the car. I love the flat 4 burble as much as the next scoobyphile but the noise does get tiresome after a while.

Switched to the original Prodrive exhaust and really much prefer this setup for a number of reasons.

1. You get a far more 'cultured' sound, you still hear the burble but can now also hear clearly the induction sounds and BOV.

2. The sound no longer dominates the driving experience, sometimes you want to whisk along quickly without letting China know you're pressing on a bit. I find myself using more of the rev range (as its not so loud) and having a better driving experience

3. Very slight improved turbo spool up time - perhaps due to slight increase in back pressure

Would recommend current setup - other option if I were buying new or secondhand would be 3"Milltek. Litchfields cars always sound good but focus on useability. Also you wont need a remap as these are high flow exhausts.

Hope that helps

 

 

That's what I've got but the full system with the sports cat. Sounds immense. Good burble and meaty on throttle.

 

Like you said each to there own...!!

 

Great stuff guys thanks for all your help. Will keep an eye on a prodrive box then. Good stuff

 

Great thread! I'm asking myself the same thing. What system should I use to reduce noise and not performance?!

Would it be enough with 2.5" mid pipe for 400bhp? And to lower the DB below 90, would it be enough to get a prodrive backbox? that would be the only silencer then.

I have now 2.5" system with 4.5" backbox. And I have added a small resonator in the mid pipe but stil at 98 DB.

 

I have always wondered what the answer was. I didn't want to use a restrictive bung. I think the answer is resonated parts. Also, my feelings are that the loss of the huge exits mean that back pressure can increase, better spool with less volume

 

but with above 400bhp i have heard that you would need some space :P isn't that true?

 

got a full mongoose on mine........93db @5750rpm 1.5m away from car.......great if you want a quiet system........does not hinder performance in the slightest I'm running just under 600bhp and will be running close to 650 in a few weeks.......scoobyclinic use it on all their race cars

 

My wr1 was 600bhp at 97db

 

My Revolution 3" copes with 400 BHP and must be one of the quietest systems on the market

Shaun

 

keep them coming! but what about resonaters?

 

yeah, I'm wondering about that as well - does a resonator restrict performance?

 

Got a full TSL Group "N" on mine, copes well with 400.

Not too loud, but breathes well.

 

put some sound deadening in the boot, under the rear seat and on the rear doors. might add a bit of weight but it doesn't half cut out the noise.

 

I'd reccomend you go for a Miltek, they're not intrusively loud but are still really good systems, drop me a pm if you'd like a price

 

tye the reveloution system i have it a its just right has i use to have aloud system but just got fed up with it