Originally Posted by Z1 Performance

the safest one is the one installed properly, with the proper thought going into supporting parts before installation of the kit begins, and the one that is tuned by a knowledgeable person on the subject car

Originally Posted by concuthatbu

I think Stillen supercharge stage 2 is the most reliable FI out there for Z. Stillen even gave me 36K miles warranty on the engine. I dont think any other FI out there is as reliable as Stillen and give warranty. On top of that, with stillen supercharge, you dont have to worry about dirty filters which sometimes are really difficult to replace.

Vortech supercharge would go second.