I've been told by several that running 1+ is fine with the stock intercooler, unless you're trying to track it or doing a bunch of Autobahn pulls in a row. I've been running mine without an intercooler for a few months without issue...but I happen to be putting in an intercooler today, to be safe.
A charge pipe is a necessity. They break quite a bit on stock cars, and tuning will make it happen even sooner. I think mine popped about a month after my first tune.
If it were me, I'd do them in this order: charge pipe, intercooler, down pipes.
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