losing power sucks :(

Currently I am o stock header/cats as I decide what I plan to do. I am thinking a RTP with stock headers and maybe a whole new exhaust.

Another factor to think about: You can get away with running the stock ECU tune with most simple bolt-ons (e.g. HFCs, etc), but a full set of intake/exhaust boltons including LTH pretty much requires a dyno tune. I know because I'm running LTH on my stock tune right now (temporarily), and the bottom end of the rev range is horrid once the engine is heat-soaked, it's worse than stock :)

Any idea how far you guys are from releasing the intakes? I was going to buy intakes sometime next year, probably around February for my birthday. Was going to go with the Stillen G3's, but if your's are being released sometime after that I will probably wait to see the results before making my purchase.

That's the cost of having a catalytic converter in the XYZ pipe.
Put that same catalytic converter into test pipes near the engine (like regular HFC's) and it drops 6+ HP.

Tony,
You don't seem to have a bung for the o2 sensor in the XYZ pipe, can you get by without placing it after HFC? And do the ART pipes attach to the factory exhaust mounting bracket?

Stay in touch as you change your setup or plan to make changes. Particularly if you change the whole exhaust too. I'll have something very interesting for you to dyno test with your SC.

There is no bung on the XYZ. Its not needed if you have ART pipes where they have the bung/non-fowler built in. With the CEL kept off, there is no need for additional bungs unless you have some kind of special set up like what is typically seen with forced induction systems.

Currently running F.I. LTH's with the GT Haus exhaust. I love it! Granted the LTH's won't work with a twin turbo setup but then again I don't know if the art pipes would either due to the increase in heat, maybe Tony can chime in on that.

Also Tony, I'm using the GTHaus front Y-pipe it comes out into a 3" collector that connects to the 2nd mid pipe, is your xyz resonated pipe also a 3" outlet? Also do you think I'll lose any hp if I went from the unresonated pipe to your resonated pipe?

Has anybody ever dynoed LTH as their LAST mod as opposed to their 1st or 2nd? We all know that the first mod on our cars will always be the highest, no matter what it is and then it goes down from there.

I'd like to see someone with intake, exhaust, TP/ART/HFCs, and tune dyno their car before installing the LTH. I personally have a feeling, the difference won't be very big at all, especially if you're replacing the ART Pipes for LTH.

The F.I. LTH thread has some a dyno result like that, so does Semtex in his journal.

Heat isn't a problem. Sometimes the EGT can actually be lower on FI because the optimum F/A ratio is typically much lower.

The XYZ outlet is 3.0" diameter and there is no loss at all with the resonator. I wouldn't be surprised if you made more power with the XYZ pipe.

That's a bold statement, care to explain why you think that could happen?

At least on the 350Z, the XYZ pipe has out dynod everything it has been independently dyno tested against. So if it happened on the 370Z it wouldn't exactly be a surprise.