You should be running spark plugs that are 2 steps colder than stock. I currently run NGK right now, but have ran Autolites in the past. Both have done me right. Sorry can't remember the part#s. As for the fuel filter, I don't change mine much different than I did even before the nitrous. But I had one clog up on me and was making my motor stall under 2,000 rpms. So ever since that episode I change my fuel filter about every 5,000 miles. Given, I don't drive my car a lot either...just on weekends really. What year of Mustang is the kit going in? Have you replaced the stock fuel pump? Is it really big enough for a 150 shot? I run a 155lph in the tank but had to step up to an additional MSD 200gph inline pump also...to compensate for the increase of nitrous going into the motor. You have to make sure your fuel system is pushing enough fuel volume. Do you have an aftermarket ignition? I didn't see it listed in your sig. You should get one when running nitrous. I talked to NOS tech...and with my Crane HI-6 ignition & PS91 coil they said you don't have to close the spark plug gap down to .035. Stock is .054, they said that gapping the plugs at .050 would be fine...especially if you have an aftermarket ignition system to help burn up all that fuel and nitrous the motor is taking in. So there is no need to swap out/in plugs when going to the track. Just gap the colder plugs at .050 and be done with it. I haven't noticed any loss in power from that minute of a difference in gapping.
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