Advice Needed?

[DSMkel]

Need some advice since I know there will be people on here that have experience with these parts.


I'm gettin a Greddy turbo timer from a friend of mine who's brother bought it for his civic, but never used it. It's new in the box. I'm paying $70 for it which I know is a good deal. My question is "how the heck do I install this thing?" Do I really need the $15 wiring harness for it or can I hardwire it?

Injen intake pipe for a $100. Only a few months old, but has very little evidence of being used.

Greddy Profec B boost controller for $250 used.

Thinkin about makin top half of upper intercooler pipe outta 2.5 inch exhaust pipe. Already gettin lower half with 1G BOV flange for $50 used.

Gonna get 2.5 inch exhaust from the downpipe back for around $250 with a 5 inch tipped Hiayama muffler that I payed nothin for. Will this be good enough for a future 14b upgrade, or should I just go ahead and do 3 inch?