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First off, those cams have a lot of overlap and duration..so you're not going to get full use out of the nitrous...I would go direct port over the nozzle kits personally. NX and NOS are both great companies and produce great kits. From what I have read and heard, the NX silinoids are better, but after 6 years of nitrous use I have never had a problem with NOS silinoids...ignition wise, the msd digital 6 is a great buy...it has the two step for launch control, high end rev limit, and a nitrous retard function so when you're off the bottle you have good timing advance for all motor and as soon as you hit the ntirous it will retard ignition timing as far as you have it set. A good ignition is mandatory when you are wanting to push nitrous, on top of an already built motor. It will guarentee that you have enough of a spark to light everything in the cylinder. the hondata system is jsut fuel/ timing control. The walbro 255 pump is that way to go there. As far as what shot to run, its going to be one of those where you need to start low and work your way up. You are dealing with pistons that wernt meant to take that kind of cylinder pressure. If the rings are new and i good shape, you can push it, but it wont hold for long. I would say a 50-60 shot to be safe. More then that, on that compression, with those pistons, you are asking for it.
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Kevin 
Dynamic Mayhem Motorsports
1990 Civic Hatch w/ Bottle Fed B16 - Trailered as of 12/15/06
1991 Acura Integra - My new daily driver
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"I have returned many times to honour the valiant men who died…every man who set foot on Omaha Beach was a hero."-Lieutenant General Omar Bradley
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