Need A Little Help

I think I have the dimensions of the box that will fit in my new car. I decided to check out what Winisd would say. It gave me this:

Driver : Kove Armageddon M15D
Project by : Honest Bob
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Number of drivers : 2
Box type : Closed
Box size : 217.7 l


Relative
Freq Gain SPL
[Hz] [dB] [dB]
20.00 -12.17 110.63
21.00 -11.38 111.42
22.00 -10.63 112.17
23.00 -9.93 112.87
24.00 -9.27 113.53
25.00 -8.65 114.15
26.00 -8.07 114.73
27.00 -7.52 115.28
28.00 -7.01 115.79
29.00 -6.53 116.28
30.00 -6.07 116.73
31.00 -5.65 117.15
32.00 -5.26 117.55
33.00 -4.89 117.92
34.00 -4.54 118.26
35.00 -4.22 118.58
36.00 -3.92 118.88
37.00 -3.64 119.16
38.00 -3.38 119.42
39.00 -3.15 119.66
40.00 -2.92 119.88
41.00 -2.72 120.08
42.00 -2.53 120.28
43.00 -2.35 120.45
44.00 -2.19 120.62
45.00 -2.04 120.77
46.00 -1.90 120.91
47.00 -1.77 121.04
48.00 -1.65 121.16
49.00 -1.54 121.27
50.00 -1.43 121.37
51.00 -1.34 121.46
52.00 -1.25 121.55
53.00 -1.17 121.63
54.00 -1.09 121.71
55.00 -1.02 121.78
56.00 -0.96 121.84
57.00 -0.90 121.90
58.00 -0.84 121.96
59.00 -0.79 122.01
60.00 -0.74 122.06
61.00 -0.70 122.10
62.00 -0.66 122.14
63.00 -0.62 122.18
64.00 -0.58 122.22
65.00 -0.55 122.25
66.00 -0.52 122.28
67.00 -0.49 122.31
68.00 -0.46 122.34
69.00 -0.44 122.36
70.00 -0.41 122.39
71.00 -0.39 122.41
72.00 -0.37 122.43
73.00 -0.35 122.45
74.00 -0.33 122.47
75.00 -0.32 122.49
76.00 -0.30 122.50
77.00 -0.29 122.52
78.00 -0.27 122.53
79.00 -0.26 122.54
80.00 -0.25 122.56
81.00 -0.23 122.57
82.00 -0.22 122.58
83.00 -0.21 122.59
84.00 -0.20 122.60
85.00 -0.19 122.61

You want the relative gain as small as possible right? The higher freq are pretty damn close but the lower ones arent. Will it be to peaky?