There are 3 baffles, 1 at the front with no holes in and 2 at the back which you can see if you shine a torch up the tail pipe.
I measured the noise with stock exhausts for a comparison 93db.
Remove exhaust leaving header on car, cat is in header pipe, you can then get at the baffles with a very long hole cutter.
I cut a 38mm hole in a 44mm baffle leaving a 3mm shoulder which I can use as an anchor to replace baffle or use to introduce some sort of silencer in the future if needs be.
I'd take some pictures but there is nothing to see, it's just like looking up a length of scaffolding tube.
The noise is now no louder, still measures 93db, but is a different sound.
More hard edged and business like.
To be honest I'll be like a kid in a sweet shop if it pops and farts on overrun, flames would also be a bonus.
I was talking to a chap today who is a Porsche specialist in the next village and whom I have known for a number of years regarding the mixture, he said it will probably sort itself out as it is a closed loop system with all the mods done after the cat and lambda sensor.
Only time will tell.
Can't wait for the better weather so I can get it back on the road.http://www.talkmorgan.com/images/icons/default/grin.gif