Regarding enviroment laws, in Europe they are much stronger than on other parts of the world. Even our Zandvoort F1 track can not hold a F1 race because they would go over all sound limits for the rest of the year. Most clubs have a time window in where they can make noise

I have to agree that several ruling of the EFRA has something more of a commercial side. Approving loud exhausts is basically money in the pocket and new rules with measuring noise levels is handing the problem over to the driver. To reject all responsebillities the have scrapped the word homologation and call it now registration.

The INS BOX was a product devellopped by Serpent and indeed in the 1st year it was mandatory Serpent as the only producer had sold a lot but saddly many engines did fail. The INS-BOXes have changed over the years and are for sure no reason for engine failures.

If the EFRA did reject all exhausts making more noise than the 83dB standard then the EFRA had no races to run. On the other hand, the Hipex 2095 exhaust shows it can be done without damaging engines, again saddly no other manufacturer is willing to comply.

But hey, beside the EFRA we now have the ENS with almost no noise rules, guess who will win the hart of the racers and actually allready has done with 160 drivers on an ENS and barely 60 drivers at a EC. Even the EC-B for this year has been canceled. (see EFRA site)