looking to get into 12's w/ my 95 z28 M6. I have a completly stock LT1 minus edelbrock headers, KN cold air, and flowmaster cat-back. What is the difference betwen dry and wet systems, what numbers would each produce on my engine, and which is easier to maintain in a daily driver?

 

A wet system sprays nitrous and fuel into you intake manifold, either between the MAF and the TB, or using a plate behind the throttle body. A dry system only adds nitrous to the incoming air, somewhere after the MAF sensor, and adds the extra using the fuel injectors. The popular dry kit is the NOS 5176, that boosts the fuel pressure when the nitrous system is activated, to add the extra fuel using the "stock" injector pulse widths.

The A/F ratio adjustment on dry is sort of crude, relying on the boost in fuel pressure. You end up running a bit rich, to insure you won't go lean. The stock injectors do not like the increased pressure, so you need to replace them with a pintle style injector, like an SVO.

The wet system is easy to adjust for A/F ratio, using "jets" in both the nitrous and fuel lines to control the mix. The potential difficulty is uniform distribution to all 8 cylinders. Nitrous, like air can turn a corner easier than atomized fuel, so placement of the nozzles can be tricky.

Each system can be tuned to add more nitrous than your engine can handle. There are people using both wet and dry to spray up to 200HP on a stock bottom end, but that's a bit risky. More conservative levels would be in the 125-150HP range.