box986

I am thinking of doing cat-bypass on my car.

The FVD cat bypass seems like to have the best of both worlds in terms of all cat-bypass options out there.

Description on FVD site:

Catalytic Bypass pipe “X Torque” design made by M&M in Germany.

The "X torque" design in is a true X pipe design. It is open in the center to add backpressure for torque. Give's you 10-15 ft-lbs of torque in the mid range along with 10-15 hp in the higher rpms. Why settle for the traditional cross over cat design when you can add torque in the mid range where the 997's need it most!!

I figure a cross-over (NHP)style cat bypass may loss too much torque in the mid range and a X type which mix up exhaust from both banks (like Fabspeed?) may not gain as much on top end.

Does anyone have first hand experience with any cat-bypass out there?

1st pic: FVD
2nd pic: Fabspeed
3rd pic: NHP

Skibum

Are you sure that you want to go the route of no cats?
Is this an off road vehicle only or are you in a state with no emissions checks?

box986

Yes the cat-bypass is to be used as a track only setup, I know many has done AWE or Fabspeed 200 cell cat but I have searched the forum and seems like no one has try the cat-bypass.

Skibum

Agreed.

FWIW I am very happy with the X-Cats.

box986

Does the Fabspeed X-cats have an actual crossover in the middle which 2 exhaust banks merged or are they just welded together on the outside?

It is hard to tell from the picture since the name plaque blocks it.

Skibum

There is an actual crossover.