Making a Bullet Bill Speed Hack

First put your button activator:
2834XXXX YYYYZZZZ

Next but this line under it:
048B1138 XXXX0000

For the XXXX value's here some speed values to replace "xxxx".
C3110000 = 145 Kmh (reversed)
30000000 = Stopped
40000000 = 2 kmh
42960000 = 75 kmh
43110000 = 145 Kmh (original speed)
43960000 = 300 kmh
442F0000 = 700 kmh 
44380000 = 736 kmh 
44420000 = 776 kmh
44480000 = 800 kmh
447A0000 = 1000 kmh
44800000 = 1024 kmh 
44870000 = 1080 kmh
44930000 = 1176 kmh 
44990000 = 1224 kmh
44b00000 = 1664 kmh 
44E00000 = 1792 kmh
44F00000 = 1920 kmh 
44FA0000 = 2000 kmh 
45000000 = over 2000 kmh
45100000 = over 2000 kmh ULTRA FAST! 
Then obviously put:
E0000000 80008000 below the 2nd line then your done.
If you want to put more speed mods like if you want a 700kmh and 0kmh do this
Ex:
2834XXXX YYYYZZZZ
048B1138 442F0000
E0000000 00000000
2834XXXX YYYYZZZZ
048B1138 30000000
E0000000 80008000

Have lulz!! 

For anyone interested, there are float calculators available if you want a different speed for your bullet. Just thought I should point that out.