Gday all my names jaspo... new member first post hope im doing this right haha got to start somewhere, Just wondering if its worth making a custom manifolds in relation to power/performance increase. I am also aware that these are not race cars as I have been told before. I have heard of a few people making solid power/torque gains from making aftermarket intake plenum's, has anyone heard or read about this?? Also exhaust manifold wise.....same question is it worth the money to make a bigger diameter log style manifold or high/low mount manifold?? As my ole girl is going through a rebuild(slowly but surely) haha contemplating and weighing up options?? cheers guys