What are the benefits of getting one'* exhaust manifold ported? Will I breathe out better? What'* the cost involved?
I'm looking to pick up a little HP without doing major surgery on my car.... which is still under warranty. How much HP would I likely gain?
Yes it will exhaust better.
It'* a compromise between stock and full tube headers but will gain you about 10 hp vs about 20 hp for headers. It will cost about $150 US
BTW mine is still under warranty too but even my dealer didn't care about my headers. It will help your cars efficiency. The only thing it might affect is the warranty on the trani from over torque overload failure.