Okay, here's a guide I made up for you. Firstly, download
Alci's SAAT GUI FrontEnd. Now put folder called
Alci_s_SAAT_GUI_FrontEnd_1.0 on your desktop, along with the folders
133 &
134. Now put the
Alci_s_SAAT_GUI_FrontEnd_1.0 folder in your San Andreas directory (the place with the gta_sa.exe file and the folders). Now, run the
SaatGuiFrontend.exe file. You'll get a few "errors" asking you for the game directory, so just search for it and select the
GTA San Andreas folder, NOT any other folder that's IN in. Now you'll see the opened window of SAAT.
First off everything, go to GTA San Andreas\audio\SFX folder and back-up the
GENRL file, in case you'll want the old sounds back.
Now, take a look at
this picture. That's how the SAAT Control Panel looks like and how it also should look like to you. You may notice that I surrounded a few key things, which I'm going to explain now. On the left of the window, you see a list called
Archiv. As in the picture, go to the SFX (it may not be open, so open it) and click on
GENRL (which I also surrounded in the picture). On the right side you see a lot of Bank_# files, so as I surrounded with green in the picture, go until you find
Bank_133 &
Bank_134. Now, double-click on
Bank_133 and select the
Bank_133\sound_001.wav file. As I surrounded in the picture with red, click on the second button which will replace that sound file, and search for the 133 folder which is on the desktop. Click that, and select the
sound_001 file and double click on it. Now, do the same thing for all the files from the 133 files. After you've done that, select the 134 folder and do the same thing with replacing the files. After you've replaced all files, click the diskette icon at the top left of the program (surrounded in the picture with pink) and save your changes. And you're done! Just get on the Freeway and enjoy its new engine.

Hope this helps.