So you have the RePack installed. Now what? Here is the quintessential SLRR experience.
You can dismantle your car to the last bolt, engine block, suspension component, and body panel. Street Legal Racing - Redline 2.2.1 RePack by R.G. ReCoding
The (Midnight Club Modding World) version is the most stable and feature-rich iteration of the original engine. The R.G. ReCoding RePack is a popular pre-packaged version that usually includes this stable build, pre-installed fixes, and a convenient installer, saving you the hassle of patching the base game manually. So you have the RePack installed