What I've done on a couple of cars, is to just buy factory production style tail pipes from one of the restoration houses, then adapt it to the aftermarket exhaust system to complete a correct appearing system at the only area you really see it....at the rear of the car.
I just did this on our 69 Z/28. I couldn't use the supplied tail pipes with the SGF70 Pypes kit anyway because they aren't even close to fitting like the factory intended. They come out way too close to the quarter panel and dump there, plus they have the incorrect 70 and up style hanger that doesn't work on 67-69, then you still have to pay extra for a chrome exhaust extension that doesn't exit in the proper location.
Rather than do that, I wanted a correct factory "appearance" so I bought correct 2" polished Z/28 exhaust tips that are bent properly and exit under the tail panel in the correct location (another $260 but that's the restoration business) and they also utilize the factory hangers back there...so it's a win win.
I then grafted them into the Pypes transverse muffler setup. The result, when the car is on the ground it appears to have a stock exhaust system. The smaller tail pipes at the end of the system are of little consequence as far as HP goes. Not to mention they are already past the rearend at that point on a transverse system like this, and are very short with less bends in them than an A-body setup would have. Very happy with the results.
In the past I used to buy the tailpipes from Torque Tech. They used to duplicate the 69 style F-body tailpipe to a "T" with correct bends so they would exit under the tail panel more towards the middle of the car, and did it with 2 1/2" and 3" pipes using mandrel bends. They sure were a nice set of tail pipes. I would have went that route on this car if they were still in business.
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