If I built a daily driver with 350 or max 375 horsepower, I would do a shorty to Y pipe similar to stock third/fourth generation F body into a single 3 inch exhaust transversely mounted and dumped out the side. When I had a Edelbrock TES and full exhaust with no cat set up on my old 87 Firebird and went to 1 3/4 and dual 3 inch, the car was more then 2 tenths quicker in the quarter.