That's either one damn expensive exhaust or a damn cheap SC setup. It must be an Amuse.
Have you seen the price of a basic Vortech setup
You can pick up a basic Vortech kit for around £3K new from Assaultech
Decent exhaust (Not cheap ebay tat/japscrap/scorpion etc.) £6-700
Decent Y-pipe £150
Set of Berks £400
Poopcharger £120
Your pretty much at £1500 straight away, add in a plenum spacer & your really not far away.
£2800 for an additional 100 hp, or £1500 for an additional 15hp
But then, what would I know about it
400hp is just about doable NA? Really?
If I ever built another Z, I would love a high revving NA motor. But the cost of doing that far outways the cost of going FI.
But you can add bits of the NA upgrades as you go along, spent near on a year pulling mine together. Yes could save for a SC but then I am lumbered with stock exhaust, intake and cats which make a crap noise. I would say £3k isnt touching it really on SC costs, what about install and remap with it? Not that I know but would have thought some parts of your Zed would need some upgrades to deal with an extra 100bhp? When I asked abbey about total cost of SC it was more than £3k...