View Full Version : late model stock exhaust mainfold porting question

11-10-2016, 05:08 PM
Any thoughts on porting the outlet without removing the manifolds? from underneath on a lift or jack stands? pulling the manis is such a pain

11-11-2016, 09:40 AM
I'll take 20 views and no advice as not a good idea

11-11-2016, 09:50 AM
Nothing wrong with doing it that way, as a matter of fact it would probably be easier since the manifold will be held in place by the motor, and there is decent access to the outlet from underneath. I did mine with a grinding stone on a die-grinder. Just make sure to wear safety glasses and a mask, since you will be creating a lot of rusty metal dust.

11-11-2016, 11:03 AM
Suggest setting up a vac beside the work to help keep the particles and dust down and out of the manifold. Not required, but it helps.

11-11-2016, 11:21 AM
I used a carbide cutter in the die grinder. Faster than a stone (did both in 1/2 hour) and the waste particles are larger/easier to clean up. Safety glasses are a must.