Originally Posted by Megan370z

There is still the Z1 shorty header ( Momentum copy)
which proved some great gain....

If not then I would go for the PPE LTH , you can still get the xyz Y-pipe from Motrdyne if you want a cats.

but seriously I wouldn't go with a stillen header at all since its not much better than OEM... I bought a pair of these in the very beginning when there wasn't much option and I did regret them !