i got the sct xcal 3 preloaded with the box tune. so is it really worth me spending the 400 on thre dyno tune? will it make that much of a diff? car is a 5 speed .see mods below

 

maybe with the 100 shot, but i don't think you will see that much of a difference with those mods

 

If you haven't had it tuned since you got the nitrous, i guess it wouldn't hurt to have it tuned. I don't know how much more you can get out of that set up.

 

if you have the cash do it !!!

 

No, not with those mods. I would also get rid of the dry shot and convert that to a wet shot! Much safer!!! I had a 100shot on my car with no tune, NGK TR6 plugs gapped at .035" and 93octane. I would strongly urge you to go that route if you don't get a specific tune for the N20. I would also reccomend you NOT to use the N20 with any of the programmed tunes that you recieved. The tunes that come with the programmer advance the timing which is a very bad thing for use with the nitrous. I never even used a tuner with my set-up that's why I was able to get away with just the 100 shot. I had an NX wet plate set-up. Best on the market by a mile. Their solonoids are awesome and there isn't any other brand that can compete within the tolerances they run! Get a dyno if you want to run the n20 or get rid of the spray with aftermarket tunes. Or you could just put your stock tune back in everytime you want to spray. I personally wouldn't go any other route with n20 without a flip switch. Turn the **** to your desire on the fly. SCT makes them. They hold up to 4 tunes as well.