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Get on Youtube, search - Yozza, BTM, Scorpion RS192, Scorpion SRN019, Janspeed, Ktec Ultra, Miltek, Piper, AAS, Prospeed... then you should have most bases covered. Might as well go by sound and performance variation is the difference between eating breakfast or not.
You then want to check decat and silencer/unsilenced versions of some of the above as well...