Finn

The side pipes solution is a good one, but the noise can be louder under certain circumstances. If this proves too much get some different silencers with more packing in them to give better sound absorption.

You can experiment by getting a couple of 90 Deg curved end pipes made up cheaply and just trying them. If you find that this solution suits you then get them done in stainless.

Personally I like the noise generated by side pipes (like Richard !) but it is a personal choice.

On my racing +4 I had a long pipe system with a good silencer , but the system developed a resonance and would fail noise tests at circuits like Zanndvort and Goodwood. I changed the system to a +8 silencer and a side exit just in front the rear wheel , and the system was a lot quieter , no resonance, I passed all the noise meter tests first time, and it was fine on the road. As Richard says it is no more noisy in steady state than the standard system , but will be louder under acceleration.

Andy G
1999 +8 , Indigo Blue.
Ex-John McKecknie/Mike Duncan 1955 +4 racer.