AU I6 NA, what’s realistic?

[stiddy]

Im about to get my car back finally after long awaited exterior/bling mods on my XR6 and looking to start some real performance mods. As some of you know I had a turbo kit that I got rid of for my own reasons so now, I want to get a move on with some NA mods. I’ve got the wild cam and exhaust. Extractors and edit will be in the car by the end of the year.
What I want to know is if I get the engine done what sort of ET can the AU I6 realistically get without being undrivable? At the moment I’m getting 14.9’s basically stock. What’s the AU I6 got in it? Seems the best so far is a 14.2 and a claimed but not proven 13.9. Which honestly is fairly pathetic. Is that it? Is that the best an AU I6 can go NA?

Mods when I ran 14.9:
3inch highflow cat, 3inch mandrel bent exhaust with 1 small sports muffler, 3inch mandrel bent intake from throttle-body to pod in airbox.

Mods since last at the track:
Rebuild/strengthed T5, 5 puck brass button clutch and billet alloy lightened flywheel, 3.7 diff gears 4 pinion LSD center and billet axles, a bloody wild surecam and Fusion Speakers lol. Also Kingsprings and Koni shocks.

Mods to waiting:
Difillipo extractors with 3inch collector, Edit with custom tune, a Ripshift shifter and some sticky tyres.

Cheers,
Stiddy