Whilst my experience is not of the 'Sports Exhaust System' offered as an upgrade on standard +4's, the exhaust system on my ARP4, which I guess is similar to the sports exhaust was certainly too loud after half an hour, with the result that I have changed the silencer for a slightly quieter one. This seems to be the experience of most people on here, however, if the 'Sports Exhaust' is a free option, I would suggest that you take it, and if too loud, change you silencer later. I'm sure there will be replaced standard silencers in the For Sale section from time to time, at very reasonable cost. You are then able to have a quieter car, still with a nice sound but with a more efficient and better manifold.
Result, the best of all worlds for not a lot of money.
Let us know what you do.
