10% or 5% pulleys

89sc5spd

Registered User
just wanting to see a general opinion on a 5% and a 10% pulley, like differences in HP gained between the 2 and risk factor between the 2 besides increase exhaust back pressure.

Even with the full true dual exhaust, are pulleys still a risk?
Any info is greatly appreciated
 
There's allways a minimal risk with OD pulleys, but nothing really to be worried about. I have 18% OD pulley and have driven 3000miles since the installation with no problems. And I can assure you that those miles have not been "slow" driving.... :D

When your exhaust is done properly the 10% pulley is ok mod. You should have no troubles unless there's already something wrong with your car(head gaskets etc).

Go for it, but remember to do your exhaust first!!
 
What if you've only done the exhaust from the resonator back? I still have stock exhaust manifolds, cats, and down tubes... Would a raised top and 5 or 10% pulley be a risk?
 
I would stick with 5% until the exhaust is done completely....
 
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