620R exhaust

[Shaun_E]

If you really want to try a side exit silencer then the quietest one you can get is the Raceco ( https://racecoexhausts.co.uk/). If you can fit the long 950mm one in then that will be the ultimate in noise reduction - I have one on my 260bhp Duratec and it is about 94-96db at 2/3 RPM and is OK at Goodwood on a noisy 105db day. Also OK at Castle Combe on a 101db day. I think your biggest problem though is still going to be the flatshift.

[nigelpugh7]

Shaun_E said:

If you really want to try a side exit silencer then the quietest one you can get is the Raceco ( https://racecoexhausts.co.uk/). If you can fit the long 950mm one in then that will be the ultimate in noise reduction - I have one on my 260bhp Duratec and it is about 94-96db at 2/3 RPM and is OK at Goodwood on a noisy 105db day. Also OK at Castle Combe on a 101db day. I think your biggest problem though is still going to be the flatshift.

Ummm, hello? Did you see my very first response to the original posters question!!!

[sfaulds]

The rear exit isn't a problem on UK circuits - our hire cars have been on most of them (including Bedford) without issue. A side exit is ridiculously loud on driveby though.

[Pdelamare]

I've had no end of problems getting my Levante quiet enough, the exhaust noise itself was cured with the biggest custom Raceco silencers I could fit, the real culprit was the paddle shift system on downshift causing bangs.

This required half a day with Mountune and Geartronics on a test track to resolve.

[DCL]

The ideal is to use torque recovery to soften the shock to the drive chain, but the retarded ignition means the fuel is not fully burnt when the exhaust valve opens. From a mechanical point of view this is not a problem, and kindest to the engine and gearbox. Using the ignition cut solves the backfire problem but the power is restored instantly which can cause issues. Fuel cut can be used but my experience of that is that this is no better in terms of backfire.

Here's a vid of testing torque recovery . . .

https://youtu.be/dgSjbKBDZpI