[InFiD3ViL]

So once I had installed my headers I had the same setup.

It 'felt' like I lost a little bottom end torque. That didn't bother me as much as the Nascar Pit-Lane level of noise the long tubes/muffler delete/resonator delete produced. Not only was it insanely loud, I could not stand how raspy it became, as I also have no cats.

So I bought the Legato axle back and definitely feel that I got that low end TQ back again. Plus, now it sounds amazing...not including the drone I now have.

So yes, you can lose a little bit of TORQUE on the bottom end. But Power? No. Adding Longtubes will give you a heap of top end power. You should not even have to ask. You should be able to feel this on your own, as I know I did.

But that begs the question...did you get a tune or have your X4 selected for the long tubes? Because you are leaving power on the table if you didn't. The long tubes will generally cause a lean condition with your AFR unless tuned accordingly.