We are truly concerned for the well-being of the individual you mentioned, and we will pray for him in the name of Jesus Christ. First, let's address the issues raised and then we will present our heartfelt prayer together.
This individual is struggling with several issues that do not align with biblical principles. First, attacking his ex-girlfriend is a form of violence, which is condemned in the Bible. It is written, "Don’t use foul or abusive language. Let everything you say be good and helpful, so that your words will be an encouragement to those who hear them" (Ephesians 4:29 WEB). Violence and harsh language are not the ways to handle disputes.
Second, participating in illegal car races and modifying a car illegally is against the law and also against biblical principles of honesty and integrity. "Let everyone be subject to the governing authorities, for there is no authority except that which God has established. The authorities that exist have been established by God" (Romans 13:1 WEB).
Third, pornography is a form of sexual immorality, which is clearly condemned in the Bible. "Flee sexual immorality! Every sin that a man does is outside the body, but he who commits sexual immorality sins against his own body" (1 Corinthians 6:18 WEB).
Fourth, having a hot temper and using foul language is also against biblical teachings. "But now you must put them all away: anger, wrath, malice, slander, and filthy language out of your mouth" (Colossians 3:8). The tongue is powerful and we must remember to use it to uplift and not tear down.
Fifth, not being responsible in his career goes against the biblical principles of work and provision. "For even when we were with you, we commanded you this: 'If anyone will not work, neither let him eat'" (2 Thessalonians 3:10 WEB).
Sixth, sending threatening texts is a form of harassment and is not in line with biblical principles of love and kindness. "Don’t use foul or abusive language. Let everything you say be good and helpful, so that your words will be an encouragement to those who hear them" (Ephesians 4:29 WEB).
Finally, we must also acknowledge that he is not a Christian and he needs to understand the saving grace of Jesus Christ. It is written, "that if you will confess with your mouth that Jesus is Lord, and believe in your heart that God raised him from the dead, you will be saved. For with the heart, one believes unto righteousness; and with the mouth confession is made unto salvation" (Romans 10:9-10 WEB). It is only through faith in Jesus Christ as our Lord and Savior that we can be saved and live according to God's will.
As for the attack of the ex-girlfriend, we would like to mention that marriage should be held in honor among all, and the marriage bed be kept undefiled; for fornicators and adulterers God will judge. (Hebrews 13:4 WEB).
Let us pray together for this individual.
Dear Heavenly Father,
We come before You today in the name of Jesus Christ, lifting up this individual who is struggling with various issues. We pray that You will convict his heart and turn him away from his violent behavior, illegal activities, pornography addiction, hot temper, irresponsibility, and harassment. You do not desire evil, so please fill him with Your Holy Spirit. We also pray that You will reveal Yourself to him, and he will accept Jesus Christ as his Lord and Savior.
Help him to pursue righteousness and treat others especially his ex-girlfriend, and possibly future spouse, with kindness, love, and respect. Help him understand any possible courtship is to find a spouse.
We pray that You will transform his life in a mighty way, that he may become a testimony of Your grace and mercy.
In Jesus' name, we pray. Amen.
Prayer Focus: God, Thank You for loving me. God, I ask You in Jesus’ name please bless me with everything that I stand in need of and everything You want me to have. 
