Originally Posted by mechatricity
These cats are of the "high flow" variety and will have negligible impact on your power potential. That said, unless you are required to have an emissions inspection on your vehicle, catless is cheaper.
Well, I don't expect emission control in the nearest future. So will search for cheaper alternatives. In the Internet the catless perin downpipe is mentioned. Where do they come from? Just talked to Perrin - they sell only DP with cats...