'17 OEM Exhaust?
 

Hey does anyone know what they changed on the newer cars? I noticed the tips on my '17 are different from previous years but is that it? Haven't been able to track down much info on this.

They changed a fair bit. Since they were bringing more air in they needed to get more exhaust out.

For some reason I find the idea of reducing exhaust pressure loss strange. Isn't pressure loss the reason exhaust systems exist?

The whole thing is riddled with poor translations. I don't think they meant to say to not lose pressure but more to not lose power through increased pressure.

I know. I just love "English as she is spoken" translations. In humfrz daze English as translated from "ENGLISH" was a hoot. Back when Cook Neilson ran the late Cycle Magazine, he or Gordon Jennings wrote a hilarious piece on it. I have a 72 Norton shop manual rife with words many here would find impenetrable. "Pressing in the gudgeon pin" sounds so happily naughty.

So the header was the only major mechanical change, and the rest was just a material change to be more aesthetically pleasing by better resisting corrosion....on parts under the car....that virtually no one can see unless you shove a mirror under your car in a parking lot.

They also apparently changed the flange between the mid pipe and the axleback. So there are basically no axlebacks that fit the 2017's.

I bet there are a couple of doxen threads om here that say "my exhaust is rusting already is that normal?" . People just don't get the fact exhaust rusts anymore. Back Until about 20 years ago you were lucky to get 5 years out of an exhaust before it rusted through someplace. Many a soup can and some gear clamps saw the underside of my cars back in the day.

Why is that strange?
I'm assuming they want to achieve better exhaust gas velocity.

I know, but that's my point. People see the outer surface corrosion and freak out thinking their exhaust is going to produce a dozen holes and or fall off the car tomorrow. And I get that it doesn't look great, but again, unless you get down with the intention of looking at the underside of the car, you're never going to see the corroded plumbing, and at the end of the day it's still going to work just fine for several years. So they made changes to the post-header plumbing just for aesthetic reasons (according to the documentation you posted) to stop the complaints from the aforementioned couple dozen people who find it abnormal or worrisome. Nevermind that some people can't even wait for the car to experience a handful of heat cycles before they're ready to throw an aftermarket exhaust on it. It's just such a non-issue to me, and I know I'm preaching to the Tchoir.

Unless I have missed something, I believe the tips on the '17+ cars are the same as the ones they changed to in '15 & '16 to help fill in the cutouts better than the original U.S. ones. Of all the cost-cutting measures they made for the stateside cars that was easily one of the worst to me. And even these newer style ones still don't look as nice as the ones on the European and Asian versions of the car that actually extend past the diffuser section, but are better than the ones we originally got.

The flange change Jasonb mentioned is news to me, but I think other than that and maybe a hanger location they didn't change the axleback section in any functional way.

I don't think you realize, but this post is gold. I have been trying to find this information for some time, albeit not that hard, a simple google search didn't bring it up though.

Yeah, I want an axleback on my '17. Don't know what I can use. FT86Speedfactory still lists the parts as 2013+.

axle backs are limited to like 1 or 2 companies. the flange at the axle back if different than the '16- models. let me see if I can find it..



**edit:

https://www.86speed.com/products/rem...uble-wall.html