Hi Rich (and all) Until I have the time to properly update the page on the DOC site, here are the results of the dyno tests ("at the flywheel" figures) www.cix.co.uk/~mgutkowski/stock.jpg www.cix.co.uk/~mgutkowski/withcats.jpg www.cix.co.uk/~mgutkowski/nocats.jpg Also here's a photo of the system with cats fitted: www.cix.co.uk/~mgutkowski/catspic.jpg I'd like to stress that some figures were obtained with fuel adjustments and removal of the cold air intake valve - full text to come. The exhaust will not perform miracles.... but if you're going to play with cams, lightened flywheel, porting and polishing..... then you won't get far without a free-flowing exhaust. My observation of Chris' "medium" system is that it sounds very "european" as opposed to the deep burbling of an american exhaust (like the Island turbo kit). It has a nice deep throb at idle, but positively screams when revved. Martin #1458 (getting a new system) #4426 (getting the old one off #1458!) d_rex_2002 wrote: > Martin, Chris and the whole UK group, > > If a picture is worth a thousand words, you guys should be able to > write a novel about this new SS Free Flow Exhaust system. While I > did read that the system does not come with the polished appearance > that is in the photos, it still looks like great SS craftsmanship.