The real question is "How much?". Even head/cam setups have a higher failure rate than stock cars, mostly due to valvespring problems. Superchargers bring with them belt tension, wear, noise, slippage, and alignment problems. Turbos bring with them immense heat and packaging issues. Either brings increased intake temperatures that increase the likelihood of detonation, which is the biggest cause of engine failure on forced induction engines.

However, the single most important factor of long engine service in a FI motor is to get a good, safe tune. 13:1 on a FI engine is NOT SAFE, they must run richer/cooler to stay in one piece. Closer to 11.5 to 1 I think would be perfect.

When it's all said and done, they can be made as reliable as a good H/C setup, but it takes a lot more time and work to get them there. Because of the added components, you will also have more maintenance to keep track of.

Prevailing opinion seems to be that for the street, FI is fantastic. For drag racing, belt problems are an Achilles heel of superchargers, but if you can keep the belt planted, they are just fine. Also, the peeps that are having issues have not spoken with A and A Corvettes. Turbos are fantastic. For autocrossing, the progressive response of superchargers is nice, whereas the sudden hit of turbos can make the car very difficult to drive. For road racing, it is a similar situation, but it is worth mentioning that most road racers and autocrossers stick to the simplicity and drivability of N/A engines for a reason, but they do not go crazy on the NA package either. They keep things simple and docile. The bottom line is "How Much?" What do you want to give up? You will give up something no matter what direction you go. In the end you will OBVIOUSLY make the decision you think is right. I dont think I made a complete mistake, but now I want more and on the motor I can only get about another 50rwhp and that would be pushing it. On the spray I can dyno what I want, but I have been trying to get my nitrous setup working the way I want for a long time now. I have a few bugs left to work out, but I am getting really tired of it. I have went thru a crazy amount of nitrous to have only sprayed only one person in 2 years. I am not saying I dislike nitrous. I am saying I am frustrated with the direction I am going.