Dick,
The modification was done in two stages because the headers and enlarged throttle bodies take longer to obtain because they are handmade on order. Anyway the first stage was the cold air intake, the stage 5 software conversion, new suspension, new exhaust system, lightened flywheel, and new differential with shortened final gear. The first differential my dealer (Global Imports in Atlanta) installed was defective and had to be replaced

and greatly complicated my story to my wife of why my car was in the the shop so long to get new tires and wheels. The car was faster after the first stage but dissappointing compared to my expectation. What I did not realize is how important the headers and larger throttle bodies were to the overall result.
I did the complete conversion including the "made for Dinan, one piece, 17 lb., aluminum wheels and put 18" Michelin Pilots on, which are a tremendous improvement to the stock Dunlops.
The car is really, really fast and pulls like a freight train through all gears (yes, even 6th!

). I have taken it up to 160 and it wasn't breathing hard only flattening to the road.
What I am most impressed with is that all of the handling, throttle response and agility has only been improved and not tampered with. The lightened flywheel actually makes it easier to shift and the throttle response is absolutely awesome.
I took a guy from Butler Tires which is the high performance tire, balancing, etc. place in Atlanta for a ride and he quite simply stated that it was the most impressive rush he has had in a car that a customer has given him a ride in. This is particularly complimentary since they only work on high performance cars. They had a MB AMG CLK 55 in the day before and he said the S2 made it look pitiful in comparison.
It was not all rosy with Dinan however. Not only was the differential bad but one of the headers was made too big and rubbed the steering box on hard right turns (something I do constantly

). That had to be replaced and one of the new springs in the left rear suspension had a different stiffness response allowing the wheel well to rub the new Michelin Pilot. All of this has now been corrected, but I lost total credibility with my wife who smelled a rat because of the back and forth to Global. My tech, Chris Brown, at Global was phenomenal and adopted the car like a needy child. I had a fixed price agreement with Global that I negotiated so there were no ugly financial surprises. It is expensive and I would have never thought I would have nearly $100K tied up in a car but it is worth every penny. Once they cured the parts problems it is as advertised, "the baddest boy in town"
Best,
Evan