Kind to hate bringing back an OLD thread, but...
I put these short tails on my Z about two weeks after buying the car, which it only had like 12 miles on it when I got it, maybe 200 miles when I installed the short tails. As of today, just a few miles shy of hitting 1k.
The only major drawback I have with these is the fact that at certain rpms, there's one or two interior panels that rattle a little. That's it.
They are loud inside the car at the two drone rpms (around 2k and 4k), but not really loud outside. They're nothing like a fart can on a Civic or a stock Mustang or Vette under WOT. They're just loud enough to sound good and let you know something has been done to the car.
At cruising speeds, they're almost silent. Though under acceleration at cruising speeds (60-80 mph), it can get a bit loud inside.
At idle with an otherwise bone stock exhaust (non-Nismo), it has a nice loping to it. I've had friends ask me if I've cammed the motor. I think this is due to the Y-pipe. I've heard videos of the short tails on Z's with an H or X-pipe, and they don't have that loping.
When I installed them (my brother helped), the right pipe sat higher than the left. We ended up using two or three of the included spacers on the hanger bracket. Which reminds me, we didn't remove the heat shield on the charcoal canister either, just bent it out of the way while still covering/protecting the hoses. It's very light, soft metal and bends extremely easy by hand.
With the left pipe, it was about an inch too long no matter what we did. So in the end, we broke out the good ole' hacksaw and lopped off an inch of the pipe.
Lastly, I honestly did not, and still do not notice any loss of low end torque. I don't know where all of these people are coming up saying "oh I lost a bunch of low end torque, no back pressure, blah, blah, blah...". It's simply not true.
Through the past couple of months, my brother and I have swapped cars (he has a '16 Sport), when we drive somewhere just for the heck of it. I drive his car the same exact way as I drive mine, and there's absolutely no difference at all between the two, other than the fact mine sounds better, and definitely sounds better inside than the piped-in exhaust sound through his Bose system.
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