Stock tune, canned tune, email tune, or custom tune all have one thing in common, commanded AF ratios that should be safe, care to enlighten me as to how the LTs are going to disrupt the tailpipe AF ratios on a car that came with 2 wideband O2's before the cats??
I asked Brenspeed what changes to the tune they make for the Boss intake and they said little to none. I will ask again what they change for the longtubes and how that is any different from stock headers with cat-delete pipes. I doubt it will be much different. A/F ratios are more heavily influenced at the front of the engine on the intake(MAF) side anyway.