I have the Motordyne LTH w/ Hemholz resonators. I went with the Motordyne LTH setup because of the option for the resonator primarily. I have a Fast Intentions non-resonated exhaust and had Motordyne Art Pipes installed prior to the LTH setup. I thought the Art Pipes kept the car quiet when I wanted/needed to be but the car screamed when full throttle with no rasp.
I owned Fast Intentions LTH several years ago on my first Z and they are exceptional quality as well. However, I had a Fast Intentions exhaust with 18" resonators on that car.
I don't think you can go wrong with either. I'm also a big advocate for anything and everything Z1. But if you are going to do headers, I would recommend going with a Long Tube to experience the full benefits. Really just comes down to what you are looking for from an exhaust note/volume perspective. Power wise, they should all yield similar results with a tune.
Personally I think the best sounding Z I have heard was Motordyne LTH w/ Hemholz resonators and Motordyne Exhaust. However, I chose the Fast Intentions exhaust because I preferred the design/look of the exhaust, especially with the Carbon Fiber mufflers. The FI exhaust is also substantially lighter than the Motordyne Exhaust, and cheaper while maintaining excellent quality.
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