Absolutely no loss in low in grunt. In fact i have to say that's where the largest gains are. And as for the re-map, unless significant changes are made to intake/exhaust, the remap will only truly affect idle and full throttle conditions. Within the learning limits of the computer, the computer will adjust A/F ratio (using the O2 sensors) to the correct values during part throttle operation. That''s why, for me, I only see any popping at closed throttle deceleration. That's the great thing about EFI.
I kept thinking about taking pictures, but didn't. It is pretty simple if you have a cutoff wheel, welder, and 3-4 hours of time. I got the idea from a post on utube from someone who did a similar mod. As I said, I determined to try it, and if I didn't like it, I'd go get an aftermarket exhaust. Good thing I did! Saved a LOT of money. AND it got me out in the garage for a morning which is hard to do since I sold my last project car.