[Aussie Mike]

Hi Alffie,

I've built a few sets of working side pipes now and I would say it's virtually impossible to get them down to legal noise levels (90dB).

The more HP you make the more noise that goes along with it. There's just not enough volume and length in a set of side pipes to slow and baffle the gasses enough to get them down to legal levels. Any baffles that would get you down to the legal limist are going to be so restrictive that the car will barely run let alone rev or make decent power.

Cheers