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I know on the Aston Martin Vantage for instance, that the simple removal of a fuse means that the active exhaust valve remains open, thereby giving you the full noise all the time. I have searched high and low in my owners manual, especially the fusebox section, and cannot find the same magic fuse.

Can anyone shed any light on how to achieve the same result without resorting to an exhaust change?

Ta.

I think someone mentioned somewhere you may be able to physically clamp the valves into the open position to give you the full sound all the time. Try a search to see if you can find it...

Could you not just pull the pipes off the exhaust flap actuators ??

Deepends if the system works on vacuum or pressure and what the actuators do.....ie, if they hold the valves open or closed. My guess is the nutral position is open as they stay open when car is not running.... may also be another issue, the map of the sport mode must take back pressure into account so it maybe the car will not run correctly when the valves are open and sport mode not selected. I just deactivate the seat mode and use sport setting...............

The exhaust valve is vacuum actuated and is normally open without vacuum applied. If you remove the vacuum line and clamp it with a hose clamp, and tie it off, the exhaust valve will be full open all the time.

What exactly should I use to clamp the hoses? What will happen if they are not perfectly airtight?

Push the s button ?

sykotoy wrote:Push the s button ?

Agreed, I find this works pretty well...

Wire a capacitor across the "S" button - so it automatically "presses itself" every time you turn the ignition on?

simple1 wrote:Deepends if the system works on vacuum or pressure and what the actuators do.....ie, if they hold the valves open or closed. My guess is the nutral position is open as they stay open when car is not running.... may also be another issue, the map of the sport mode must take back pressure into account so it maybe the car will not run correctly when the valves are open and sport mode not selected. I just deactivate the seat mode and use sport setting...............

Just what i was thinking.

But Milltek offer a non-valved cat-back system do they not? Would this not present the same problem if any existed with the valves open all the time?

Rather than remove the pipes and plug them and the valves, would it not be possible to just clamp the pipes shut in situ - which can be readily reversed if an issue arises?

theaxe wrote:

sykotoy wrote:Push the s button ?

Agreed, I find this works pretty well...

Even in S mode, the flaps don't open throughout the rev range. I think there is a chap called Jeroen who explained it a while back. He is a tuner in ?Belgium/Holland who can remap RS4s to enable 100% flap opening all of the time in addition to the throttle map changes that come with S-mode.

Easiest way is tie the pipe in a knot and re attach. Or is that a no no as it doesnt involve searching high and low for a specialists clamp

BTW guys the thread marked "much better" is discussing the same.

As Gordon Ramsay would put it!

Disabling of exhaust valves.......................... Done!

Easy job for anyone!

Simply get a pair of long-nose pliers in between the hose and the valve and prise away the hose carefully until it just 'pops' off!

An M4x25 machine screw (available from any DIY shop) inserted into the end of the hose re-seals it, passing beyond the little factory fitted hose clamp, grabbing it tightly! You will need a screwdriver to 'nip it up' but nothing more than that! They can then be easily be removed again without damaging the pipes!

Then, simplest way I can see for preventing the SH1T from getting into the valves is to wrap a bit of insulation tape around the now uncovered inlet pipes! Again easy to remove and put everything back to normal for warranty issues etc.

10 minute job absolute maximum!

Get it done and enjoy!