Your motor is stock right?You might not see alot of difference,the Pypes system with good flowing mufflers would be better.1 reason to go to the HOs is adding more power.
Opps I forgot you already had the HOs....You might as well put 'em on since you have them.I don't know if you can do your in the car,I did it but I didn't have A/C.My worst problem was the steering column was in the way.I changed heads AND HOs at the same time,Tim Moll helped me.
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