I feel I am now an expert for this thread haha.
So, for anybody asking "What is the difference between Milltek Res and Non Res (resonated downpipes)?", here is my bottom line opinion:
- Marginally louder than Stock factory Sports Exhaust. In all respects
- Won't drone in comfort at all from my experience at all speeds up to 70mph
- Valves open is louder than stock but the boom/drone up to 2200rpm is very difficult to drive round day to day just pootling about
- Good crossover volume from closed to open if you boot it. Quite seemless actually
-Driving around valves closed, it brings the engine to life and has very audible low end grumble and very throaty as you move through the gears
-Sounds as above and still relatively civilised up to 3400rpm
-You 'cannot' drive around day to day, going to get your milk or whatever with valves open. If you say you can, I suggest an appointment at your nearest medical centre. The boom. Oh, the boom is horrendous.
-Crossover volume is very on/off from closed to open. On a long drive it can become quite tedious. However, Sam has an app for that. A module that keeps valves closed/open permanently. I think I might get that.
-Want to have some fun? If you are in the moment, you want to give the funky business and manually shift etc, this exhaust turns the RS4 into a NASCAR. Haha. It's intoxicating. Be warned, however, it can get on your wick after a couple of hours if you're out on a drive with your mates etc all day or just out for a long time.
-Obnoxious? Valves open or booting it in a built up area, yes.
My conclusion after buying the Non Res and swapping to Resonated centre section, and then back to Non Res is as follows. Initially going from stock to Non Res, there is a real 'what have I just done' moment. But the low end theatre and just burbles and grumbles make this car such a joy. Just a dab of gas or even idling at lights. Special.
Then going on a couple of long journeys, the exhaust noise in comfort with valves closed isn't drone. It's just exhaust noise. There's no vibration. I applied some Noico sound deadening in the boot which did take a few minor annoyances away. But yeah, after say 3-5hrs, it's 'there'. Just saying. You will hear it. Not loud. Just there.
The thing that made me want to go to a resonated centre section was about 5-6hrs into the journey, the roads opened up in Scotland and I switched to hooning it. After about 30 mins, the sheer volume just started to pee me off. Kinda felt like I just wanted to back off or not go over 3400rpm. Could it have been he long journeys there and back? Maybe.
I got the centre muffler from Milltek fitted and ummmm...it died in my opinion. Lost that character. There's boom between 1700-2200rpm with valves open. I 'thought' valves open on the resonated system would be like valves closed on the Non Res system. But nope. Just isn't. So I got the Non Res section fitted again today and I bloody love it! At least it's honest haha. I'll just live with the volume. The valves are its saving grace. I kid you not.
That's as honest as I can be but I've learned that sound, volume, resonance and drone truly are subjective guys. But unless you can first experience both systems first hand, you'll never get a real feel for in cabin sound from YouTube
Hope this helps.
Might be selling the resonated centre section. It's brand new! Less than 100 miles on it.
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