SirKnightTG

Cool thanks. I wanted to be sure so I don't go to install them at my uncle's shop (about 200 miles away from me in Houston) and be like, opps I need another extension. I'd be hosed. Well, I bet he'd try to make one if that happened. Hehe. But sounds like it won't be a problem anyway so that's cool.

That's one of the reasons I got the kooks is they're less likely to throw codes. Brenspeed says the length makes them easier to tune and they seemed to like the kooks a lot.

Rubrignitz

Oh yeah, like Lito says, the O2's will be in a different position also which will affect the signal (further downstream). The further downstream position of the cats/rear O2's will also have an effect (warm the exhaust up more if you have a sniffer test).

I had a bung piped into my midpipe right after the header collectors for a true representation of A/F when tuning. You'll want one of these too. The tuner will probably recommend it.

When everything is tuned together on a dyno tune (preferably a mustang (MD) dynamometer which will allow rpm variation tuning) the car will be perfect.

Oh yeah... ANY exhaust shop can fabricate O2's extensions... don't sweat that.

Cool man!! you're making your car unstreetable like mine! It's fun!