The reason I asked about the anti-pollution stuff is to keep the government people happy if they stick their heads under the bonnet

The sound turns a lot more heads than it used to.

My insurance company doesn't care what I do to the car as long as it's legal and I would say binning all anti-pollution might be frowned upon. As long as it looks like it works then that's all that matters.

I ended up getting Hurricane Extractors and the exhaust and extractors were fitted by Rob Bliss Exhausts.

I'll stick with the head I have at the moment. I wasn't going to change anything on this car but that lasted about a week.