Just going by your track record for one. You talked all last year and posted numbers what, once? And that was like pulling teeth to get that out of you.
Also, life happens, and a proper wall build is probably 40 man hours before you can even get the car back driveable much less test tweak and finish. Is this your only car? Can you afford to take a week or two off from work? What if something happens like a family emergency or illness or injury? Lastly, most of the big builds around here are 6 months + to completion for guys who work for a living and do it in their free time, so say things go slow it may be late summer before you're done and then all the shows in your area have come and gone.
Going forward from there you've been writing so many checks on this that if your number out the gate is terrible you'll probably be too embarrassed to post it (I would be after talking so much smack) and we'll have to either wait for you to get it raised or be put off indefinitely. Very good odds your first numbers/test won't be anywhere near 160. I'd guess 155 or so, then you find a couple deebeez tweaking, then you start throwing different amps at it or talk about doubling power to actually make your goals. All in all just trying to be realistic. I'm aiming for 160 this year too and I'll only need to throw in another one of those amps to get there but I'd only give myself about a 70% to get it done this year because ***** happens.
Considering your track record and you were on my ignore list 6 months ago, giving you 50% odds is pretty big on something like this.