I have a spoolinup COP, The coil pack # are 90919-02256 or 10r-034811 which part referenced changes to 673-1309.
I believe mine are bad and to change them, I see on our forums most owners used 673-1306. I also see in spoolinup website the same ones.
Which should be bought and I also found in the spoolinup website that they sell long coils and boots for replacement for the evos. And yes I did change the spark plugs.
I am having a sputter/ hesitation when accelerating. I did also ground the car, It help temporarily so im leaning towards the coil pack but don't know it I can change the coil and boot or need new cop(x4)

 

We sell replacement coils 673-1306 that are a direct replacement for Spoolinup COP kits. You can find them and other ignition-related products here: www.jdcustomsusa.com

 

So it doesnt matter on the coil packs being different part #s?

 

The Denso 673-1306 is the most commonly used coil for Evo COP kits. They're the exact same coil as the 90919-02250. It can replace the 90919-02256. The only difference is the mounting angle and the angled plug.

 

If i feel these coils are not enough do the gtr coils you have on your website give more spark? Or just hold more power. I see people use dci boxes. Is there anyway to increase the spark to existing one?

 

The ignition system with GT-R coils does provide a more powerful spark, allowing you to run higher boost without having spark blowout issues. If your car is making over 900hp, the GT-R cop might be a better option than the Denso cop, but they do require a tuner to adjust your ignition settings to get them to work best.