Very nice. Looks to be quality work. The merge looks good as well. That looks to be a 3" outlet where it meets the exhaust? I'd bet you'd see a 20whp gain just from this piece. Add a CAI/exhaust in, and I think you will get 25-30whp out of the combination, with about 15-20ft-lbs.
$1250 isn't a bad price for the custom work. It may be slightly high, but it's not so farfetched. Richie's is $800 for the combo and it's made of slightly thinner metal it looks like. Paul's is $1000. So ehh, it may be slightly on the high side, but it's not made of "hopes and dreams" either lol.
Made of Stainless steel (grade don't know), outlet 3 inch inside, quality sure , normaly 1 000$ but i need to add 4 adaptor for all the sensor plus the job... +200-250$... lot of money but the material and the fabrication is heavy duty.