You can buy coil overs from eBay and there will be about 600 to 700 worth off additional parts you will need to convert the car to a steel suspension. In addition to this you will have to use star das to code the car to steel suspension

 

On my sled, I see .5 point richer when the meth hits. In other words, if I am tuned at 11.5 air fuel with no meth, once it is activated, that drops to 11.0

I see ambient temps on a wot pull with a 190mm pulley. About to move to 200mm + soon.

 

What size nozzle? I am thinking something smaller than 225cc needs to be used to have less of a spike to richness, maybe a 175cc nozzle. Not even close to big enough for what should be ran but should help without losing power from being to rich.

I run a 625cc nozzle on my turbo Audi that makes close to mid 400s at the wheels, and it isn't tuned for it but the wideband o2 in that car adjusts the mixture to upper 11s