I have finished porting my plenum but I haven't gotten a chance to run it yet, I was wondering what kind of gain I could see! It was done professionally and it looks exactly like every restriction has been removed or dremeled down to a smooth airfoil (near the runners). I've done all the other free mods so I am wondering what kind of gains I could expect to see with all this done. I pulled a 14.6 with the stock plenum and thermostat, bypass and MAF mod.

 

You should see about a .04 - .08 second difference. If you bump up your fuel pressure to take advantage of more air, you will get a bit more.

 

I think you'll see more than that. Can't lay down a good estimate, but I'd say more than one tenth, less than two.

 

yeah it is hard to say but more than likely a few tenths..

 

definitly a performance gain, i know on my car the 5000 rpm barrier was gone once it was ported, it pulls right to 5500 now