I believe Ketetys was resposinble for the particle mod, I never tried it myself though and I'm unsure of where to find it. I had a look on his website though and it doesn't seem to be there. Perhaps it's not compatible with the newer versions of CoD. You can go into tha advanced graphics options and turn down 'visual effects'. Don't turn them down too much though as you can lose things such as the exhaust flame.
"Tiger got to hunt, bird got to fly; Man got to sit and wonder, 'Why, why, why?' Tiger got to sleep, bird got to land; Man got to tell himself he understand." - A calypso.
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