can i gring them down??
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Car: 1987 Firebird Trans AM
Engine: 383 TPI...very soon
Transmission: TH700R4
If you're talking about the ones in the plenum, i don't see any reason why you couldn't... I mean if you're not even using your EGR, it should matter even less. I still have my EGR and I ground the walls down, no problems, still passed SMOG too.
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