1600 isn't too much, but factor in the associated costs of parts, labor and time, and youwill be more like $2500. At that point you might as well get the trans upgrade kit from Protegegarage.com. too.
This will be the most expensive mod on my car - for stage 2 of the STX build, but I plan on getting a seperate trans to mod so I do not have to ever open the case on my original one.
I just need to find one that has the upgraded forks etc, then you have to have the case slightly machined for clearance for the quaiffe (I think the can be done with a air dremel and some patience) and get the ARP bolts. Then you'll want shift bushings, short shifter, new clutch, flywheel etc, it cascades...
One thing I will say for sure, the 2004 SRT-4 I had had a Quaife and it was amazing the difference in how it pulled out of corners unlike the MSP (which is still great by most means). Of course having 260 ft/lbs of torque could have helped too!
I thought there was a how to on installing a Quaife, but all I see is one on trans tear down. This will be my winter project and I will detail it very closely.
I also am building a new motor to the limits of the STX rules as far as over sizing bores, balancing and blueprinting etc.
So if anyone has an FSDE for sale in the NW or NorCal I'm interested!
Britt