Installation Time: Afternoon
April 09, 2017
Nice addition! Installed on jack stands.
This an addition for those of us who don't want to annoy the neighbors every time you fire up your pony, but get more when you mean to.
I bought these to augment the GT500 axle backs on my '12 GT. I was looking for a bit more of a throaty tone, and previously though I had dented my resonators in the past (turns out, that's a "feature" from the factory). I got what I wanted: throaty, lower rumble at idle, and a nice crackle and pop on downshift. There's another reviewer who complained about rasp - he may have different axlebacks, but these work really well with the GT500 mufflers in my opinion. I do think you're paying partially for the Borla name, but they're fit and finish is top notch, so to me the extra cash is worth avoiding the pain-in-the-a$$ery you can get subpar quality.
Some tips on installation: I did this on jack stands, and you'll want to remove the rear springs. It's easy - don't be intimidated (but buy a decent torque wrench):
1. Once on stands, place the jack under the diff (use a block of wood between the two, and make sure it's centered!)
2. Remove the way bar-to-body attachment bolts - be careful, removing the last bolt lets the sway bar pivot down. I didn't pay attention and almost lost a few teeth when it came down.
3. Remove the lower shock bolts. You might have to adjust the jack up/down a bit to remove the strain on the bolt.
4. This is important: inside each fender well, remove the brake line bracket. This gives the brake line enough play when you lower the diff - you don't want to stretch those.
5. Lower the diff - remove springs.
Installation is reverse of removal. Here are the torque specs:
1. Shock bolt: 85 lb-ft
2. Way bar bolt: 85 lb-ft
You should be able to snake the old pipes out, and get the new ones in now. Be sure to use the red heat shields, and carefully place the pipes to avoid the drive shaft hitting it when the suspension articulates, clearance from wiring, fuel lines, and the body. I was able to get at least one finge width everywhere (although I still fill that's close). Now that I've done it once, I could probably do this in under 2 hours. I'm very detail oriented, so it took me way longer than it should have. Oh, and while you're in there, I put a aluminum drive shaft in. If you do that, be sure to temporary place the pipes (don't attach them, let them hang down), button up the suspension, and install the drive shaft. Access to its bolts is much easier with the exhaust pipes removed.