ORIGINAL: TRYMY4.0

well...coming from me.

stock internals is based on tune. If you do not have a perfect tune on these motors, they will blow up. I am on motor 5. I have forged pistons inside with only 13psi (for now) and i'm shooting up to 17-20 soon. and should have 420+hp.

I have a fully built 4.1L and I drive mine 100 miles every single day. I drove it to Destin FL from Atlanta on more than one occasion. no problems there.


NOS for the 4.0 is not a bad choice with larger injectors, and plugs and wires. you can run 13's with a good NOS setup.