Re: Which exhaust manifold?
I just did the 1.6 swap and at first I just ran the 1.3 manifold with the stock exhaust while I was waiting for my header. I ran it like this, header and stock 1.5" exhaust, for about two weeks and I could really tell a difference especially in the high rpms. I finally got the 2" exhaust w/ turbo muffler on last weekend and I can't say I could feel much of a difference over the header and 1.5" pipe except it sounds much cooler now.
If you have to use a stock manifold I'd say go with the 1.6