An Al flywheel is definately worth it. Typically it can give you up to 20 hp or at least free it up. The flywheel itself will not give you any power, it will just reduce the parasitic power loss associated with the drivetrain in-general. If get an AL flywheel and driveshaft, you could gain upto 35+ hp.
Another way to look at it is like this, you typically lose 15-20% hp from the flywheel to the wheels.
Stock 03 GT= 260 hp @ flywheel = 210-220 hp @ rws
Say you lose (or actually get it back) 4-5% from the fly wheel, and another 3 or 4% from the driveshaft. You get something like this.
03 GT w/ AL's = 260hp @ flywheel = 226-244 hp @ rws
If you have mods already, this becomes even better for you. Say your Stang is making 500 rwhp and you have a steel or stock flywheel and driveshaft.
500 rwhp (stock flywheel/driveshaft) = between 588-625 hp @ flywheel
Take the average of that 606 hp @ the flywheel and figure that in with the flywheel and driveshaft.
606 flywheel hp = 570-527 hp at the rear wheels.
It doesnt matter how you look at it, you gain. Yes it can be pretty expensive. I just bought a RPS CYN-R-G flywheel for $424, and you can always pick up an Al driveshaft off of ebay for $230-250. A cheaper Al flywheel or even a Chromoly flywheel (about the same weight as the AL, but cheaper, drawbacks include that the friction material is NOT replaceable), are available on ebay as well. So if you shop wisely, you could pick up both items for somewhere around $500. A great investment with some pretty decent bang for the buck.
Sorry guys to get longwinded.....my boss tells me to shut up at least 4 times a day.
