That sounds like a sweet set-up! You definitely found a diamond in the rough at that exhaust shop, finding a guy capable of doing that type of exhaust work at that price is rare.
You mentioned Corsa. So my exhaust is far from anything custom or spectacular, but I too was set on Corsa. I ended up purchasing a lightly used Corsa 3.5" muffler from their Silverado/Sierra Corsa #14866 cat-back system from a forum member over on on
www.gm-trucks.com .
The Corsa muffler from this cat-back here:
https://www.corsaperformance.com/co...ucts/6-2l-silverado-sierra-3-0-cat-back-14866
Had it welded in place of the stock muffler, removed flap, and left in the resonator over the rear axle and I couldn't be happier with the sound. I'd like to add headers and a catted Y eventually.
Thought really hard about picking up the Corsa #14866 and just having a muffler shop cut and modify it to fit my Yukon Denali XL, I'm confident it wouldn't take much modification to fit. But still couldn't bring myself to drop $1,400+ on a cat-back that would need modified to fit.
I need to find an exhaust shop her in Ohio with a guy capable of doing what you had done.