Des the 3.8 wide body was made for a differant class,where they could get more grip by a wider wheel base and more importantly bigger tyres for more grip and be able to run the bigger spoilers etc.They increased the bhp to give the car more grunt,to push it through the air,ie drag of the widebody and to be then competative in its class.A narrow body 3.8 would probably be quicker around ie brands indy,but may be not around spa,horses for courses and all that.
I raced a 964 widebody for a season,it would have easily coped with another 200bhp,the cars you are refering to are the ruf turbos etc,which are all or nothing power delivery,great fun in a staright line,of which any one can do,but to drive it competativly around wigly bits, you need the power delivery to be managable, smooth,and responsive,which can be done with a good map man or motec etc
Dont be frightened of it,get some good tyres on it,and beast it.They realy do reward the driver,may be get a racer in your driving seat ,and see what can be done,if you have not already done this.Its amazing what a 964 can do,especialy when you get it out of shape.
But do not expect it to handle well ,if you are on old tyres and a poor set up.A lot of cars feel fine until you explore the limits of it,then the car will either work with you ,or bite you in the ass.You are welcome to come out with me on a track day,or i know some other drivers who regularly explore the limits of there car and driver !
Simon all you need is a cable tie,try it and see.As i said you may loose a couple of horses on the top end,but it should be a little smoother and more torque lower down.It may not work on all cars,as it depends if your car has been remapped etc,if i had thought about it, we could have done it on friday for you .If you ever get the car mapped,make sure you undo this mod,and then try it again after
But do not tell des about this super dooper mod,because he will want more power and smoother delivery when he gets some good boots on!!!!!!!!!!!!!!!