Roadsport Questions

[jimmyVX]

I have been looking at a few Sigma Powered Roadsport's and have a couple of questions that hopefully someone can help me with:

1. I drove a 150bhp version on throttle bodies yesterday - Was this an aftermarket upgrade or would it have left the factory like this?

2. The last car I drove struck me as being a little slow through the revs - does a lightweight flywheel make a significant improvement on this?

3. Do the cars with throttle bodies struggle with track day noise limits anymore than a car without?

Thanks in advance.