Exhaust and noise questions...

4.2 V8 32v Naturally Aspirated - 414 bhp
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Neuromancer
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Exhaust and noise questions...

Post by Neuromancer » Fri Jul 02, 2021 7:59 pm

Hi all,

I'm after some of your expert advice with a few questions if you'd be so kind. I've tried google/forum searches but seem to read conflicting opinions.

I have a non-resonated Milltek, and presume the pre-cats have not been gutted, the ECU is currently standard Audi map but intake flaps have been removed.

The issue is I'm quite self-conscious how noisy the car is in my little village, primarily on cold start rather than pootling.

I'm looking at options and need your help:

1. Arrange for a tune to delete the cold-start shenanigans (either a stand alone thing or part of a stage 2). For this should I gut the pre-cats to avoid "issues", and if I do need to will the car be noticeably louder at other times.
2. Look to replace the non-resonated section with a resonated. Worth asking in the classifieds for a swap (obvs with money their way)?

Caveats:

I'm just about ok with the drone with the non-resonated and have heard that no precats can raise the rev's a bit that this occurs which would help when just cruising.
I'm not too bothered about power gains and appreciate probably gutting/removing pre-cats with a stage 2 tune including cold start delete is I imagine the best idea...but I'm conscious of cost/insurance etc which I'm probably ok with but not if drone and general loudness worsened - hence the question!

Over to you..... :beerchug:

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Silverfox42
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Re: Exhaust and noise questions...

Post by Silverfox42 » Fri Jul 02, 2021 9:10 pm

Just a thought, return to a stock exhaust (Plenty about) and sell the Milly?
2017 RS6 Performance
Previous:
2006 RS4 B7 Cab, 2014 RS4 - Suzuka + a ton of toys, 2011 RS5, spec'd up + ABT exhaust, 2006 B7 RS4 'loon - 5 years of fun! 2006 Aston V8 Vantage, 2006 S4 Cab, 2005 S4 Avant, 2000 TT 225 Cab, 2001 2.5 A4 TDI Quattro, 2000 A4 1.8T Sport, 1996 2.6 80 Cab, 1997 A4 1.8 T Sport

Neuromancer
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Re: Exhaust and noise questions...

Post by Neuromancer » Fri Jul 02, 2021 11:28 pm

Thank you. Not a bad option, will ponder. Anyone else with opinions?

coffey555
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Re: Exhaust and noise questions...

Post by coffey555 » Sun Jul 04, 2021 12:14 am

As above, return to stock. You can always remove the centre res section on the OEM exhaust if you feel it is too quiet.

Virtually no drone but a very nice noise. If you keep the valves working it will not be too loud on cold startup (mine are permanently open and it's a bit much first thing in the morning!).
Misano Red RS4 B7 Avant

d7ve_b
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Re: Exhaust and noise questions...

Post by d7ve_b » Sun Jul 04, 2021 7:06 am

I’ve just gone back to stock but swapped the centre box for an x-pipe, spot on for me!

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Silverfox42
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Re: Exhaust and noise questions...

Post by Silverfox42 » Sun Jul 04, 2021 5:28 pm

d7ve_b - can you advise where you got the X-Pipe and if there are any issues come MOT time?

Thanks
2017 RS6 Performance
Previous:
2006 RS4 B7 Cab, 2014 RS4 - Suzuka + a ton of toys, 2011 RS5, spec'd up + ABT exhaust, 2006 B7 RS4 'loon - 5 years of fun! 2006 Aston V8 Vantage, 2006 S4 Cab, 2005 S4 Avant, 2000 TT 225 Cab, 2001 2.5 A4 TDI Quattro, 2000 A4 1.8T Sport, 1996 2.6 80 Cab, 1997 A4 1.8 T Sport

d7ve_b
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Re: Exhaust and noise questions...

Post by d7ve_b » Sun Jul 04, 2021 6:44 pm

X-pipe was fabricated and fitted by CM Tuning, shouldn’t be any MOT issues as the centre box doesn’t filter anything, it just quietens it down.

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Silverfox42
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Re: Exhaust and noise questions...

Post by Silverfox42 » Sun Jul 04, 2021 7:14 pm

Awesome, thank you
2017 RS6 Performance
Previous:
2006 RS4 B7 Cab, 2014 RS4 - Suzuka + a ton of toys, 2011 RS5, spec'd up + ABT exhaust, 2006 B7 RS4 'loon - 5 years of fun! 2006 Aston V8 Vantage, 2006 S4 Cab, 2005 S4 Avant, 2000 TT 225 Cab, 2001 2.5 A4 TDI Quattro, 2000 A4 1.8T Sport, 1996 2.6 80 Cab, 1997 A4 1.8 T Sport

Neuromancer
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Re: Exhaust and noise questions...

Post by Neuromancer » Sun Jul 04, 2021 8:10 pm

Thanks all. Will ponder... interesting on the revert back to OEM as although many moons ago I had been in friends RS4's I have never actually driven one with an Audi exhaust. The H or X pipe mod does seem a worthwhile option..

Neuromancer
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Re: Exhaust and noise questions...

Post by Neuromancer » Mon Jul 19, 2021 9:26 pm

Just to close this to a conclusion, I've gone for the Milltek resonated centre section as logistics of collecting/fitting a used OEM exhaust was proving tricky.

So far, much improved in all areas - start-up drama and drone both back into "civilised" territory, without being boring. 8)

ethanpratt
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Re: Exhaust and noise questions...

Post by ethanpratt » Sun Jul 25, 2021 6:07 pm

I have the same issue and yes, google doesn't help. in fact, it confuses me more. Im just glad that I was able to find this thread. i took some of the advice and my problem has just been resolved. thanks!

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