Unless you have done some DIY blower installs YOURSELF, then you don't know how easy or difficult it might be on a Viper.
Now, that 14 psi boosted Mustang; what other mods did you have and how long did it live? I'll bet that either (1) it had low compression forged pistons and some type of charge cooling or (2) it was an unreliable terror with at least blown head gaskets.
I have done DIY blower installs on Mustangs and C4 and worked on several F-Body cars. The earlier 9.0:1 compression, forged piston Mustangs were born for supercharging and the bolt-on kit could comfortably run 11 psi boost on stock internals if tuned right. But it was more than a $3K kit; it required injectors, mods to the intake tract, bigger MAF, and improved fuel system. Then I also needed a programmable mod to the computer. So it was something like $5-6K for a reliable S/C setup that could run 11 psi boost.
The C4 was another matter. I wanted to run more boost, so the engine had to be rebuilt with forged, low compression pistons. The basic S/C kit was $5K. Then the fuel system had to be completely revamped, computer reprogrammed, the crank hub keyed (to avoid spinning the balancer on the crank snout), water injection added, and much more. Not counting the ported heads & intake, I guess the out of pocket expense was an easy $10K.
Now the Viper is an unknown quantity, but there are at least the following issues:
1. Balancer is not keyed and needs to be; not sure if the crank and balancer both need to be machined.
2. Fuel system "dead ends" at the manifold, so increasing fuel pressure is not an easy option to enrich fuel.
3. Timing retard is a challenge, since no ready PCM reprogramming solution exists.
4. Engine internals are high compression and no longer forged (early Gen I cars should be good with 9.0:1 forged pistons, but then there is the head gasket "issue" with these cars).
5. Mounting brackets and plumbing will have to be hand fabricated.
Add to this the fact that you need to recover your investment of developing a kit and 99% of Viper owners probably have neither the desire nor the competence to tackle the project. If I had a nickle for every crappy install I've seen on a Mustang or F-Body, I'd be a rich man.
Don't get me wrong; I'd love to DIY supercharge my car and won't do it unless I can do it myself. But any tuner who wants to make a good living doing supercharging kits is going to install them himself in order to supplement the paltry income that selling maybe 50 total kits offers. Is the price marked up to Viper standards? Sure. But Viper owners won't put up with all the fit, finish and reliability woes that a Mustang owner will.
In the end, the only DIY Viper install I forsee will involve starting with the bare compressor and doing it ALL yourself. Frankly, the physical mounting and plumbing issues are less than 20% of the battle to get it running right.
FWIW,
