Can anyone recommend a straight through silencer? I only have about 10 inches to play with (that sounded dirty (and i wish!)) and it needs to fit 2.5" pipe. Unless I bolt one in further down the car near the CAT where I have about 2 feet of spare straight pipe. Magnaflow do all sorts of suitable fitments but no one in the UK sells them.

I have been running the car with the completely standard exhaust for longer now and I have seen 35mpg (once) driving like a complete granny.

I have also been looking at these Hemholtz chambers but you have to find out what the EGT is where you place it; normal egt's work fine but EGT's in my car are around 900 degree C so finding the formula could be difficult.