What do we know about the z1 lower intake manifold?

Originally Posted by Elmo370z

Its got to be your tuner. Are they doing a custom pro tune? My first tune with Fast intentions long tubes i made 316whp i only gained 5whp from my Untuned baseline and i barely picked up across the board. 3 weeks i scheduled another tune with a different person and come to find out I was running super lean from 2-3 and kinda rich across the board. He ended up fixing that problem and i picked up huge from 2-3 and gained 18whp at the end. For some of us we have great tuner close to us for some you have to travel. That guy in tampa made crazy numbers with ported lower and z1's upper. Hope you find a solution to your problem.

Originally Posted by ajcool2

This^^. I've gained 12 hp between tuners before with no changes to my car.