I am about to order a nitrous system and I was wondering with the pi swap how much should i go 75,100,150? And should I just go to jegs or is there a cheaper place to buy?
If it's over 100,000, I'd be wary of spraying a big shot on that shortblock.
If the miles are realtivly low (under 60,000) and in good shape, stay under a 125 and you'll be fine.
Just make sure you have a way to bump your timing back a degree if you want to go with a 100 or more.
Just buy an NX wet kit from mustang-x.com. Best price on the net for the NX kit. Get a window switch and a Fuel Pressure Safety Switch. A bottle warmer is almost needed too depending on your location (South Texas, not so much).
Better have some tires for when that 100 shot kicks in Good luck.