Hey guys I just installed zex wet system on my 1999 ls1. I was wanting to know if I could get some help tunning I have read some other forums and some say I need to do timing only and others say fuel richen and timing.. I have a stock engine with all free mods pcm tune 3 inch exhaust and I have the nitrous installed in the air lid just before the MAF. If anyone has any info that would be great