I've seen a side exit exhaust under the rocker panel... I've seen it through the side of the rear bumper, but I don't think I've ever seen anyone route their exhaust through the little panel behind the driver or passenger door?
I was going to just unveil mine when I've finished it, but it's still in the works right now. I figured in the mean time I would ask if anyone else has seen it on a Fiero?
I was inspired by the Audi TT clubsport:
I've eliminated my crossover on the rear side. This manifold will be routed downwards towards the passenger side and pass through the "hump" in the cradle towards the front of the car.
Turned down the Plog on the front side:
which will be routed back 180 degrees towards the passenger side of the vehicle where it will merge with rear bank just ahead of the clearance hump in the cradle... using this:
And from there it will pass over the cradle to the rear of the passenger side front cradle mount... and up and out of the side scoop on the passenger side if all goes as planned. I will be running only 2 bullet style resonators...
I have quite a bit more welding to do as this is the first time I'm TIG welding a full exhaust.
To each their own, I guess. But... Just because you can, doesn't mean you should. Especially at risk of damaging the very nice fiberglass scoops, if this is for the car in your signature. If you insist, I would be incorporating flex pipes any way and where possible... Keep rags handy to clean soot from the body on a regular basis too. I personally would prefer to make scoops functional for air induction as opposed to exhaust routing. Unless there are lots of skirts to send blowing upwards on your local sidewalks....
Hard to describe the routing with minimal pictures and mostly words...
To address the questions..
I have aftermarket (Fiero warehouse) scoops as seen in my signature. The opening is enough to get a 3" exhaust tip through the mesh. I will protect the back side of the fiberglass scoops with some kind of heat shield / lava mat. Someone on this forum recently used it on their firewall.
It will be a single exit on the passenger side to keep things somewhat simple and to avoid a hot exhaust pipe near the fuel filler neck / spout on the driver side.
The exhaust won't be any closer to the fuel filter than it previously was when my front manifold was a 3.8 mustang manifold routed towards the passenger side and towards the back of the car through the cradle hump. I may even use exhaust wrap to address the heat issue if it comes close to anything heat sensitive. I can also easily build stainless heat shields. I will be making a heat shield blanket for my starter motor/solenoid as well.
I expect the soot on the rear of the side scoop panel. I may stick the exhaust out an inch or two to avoid the exhaust getting backwashed onto the scoop if possible.
We'll see where the project goes I guess. I'm going to try and make it work for the sake of doing something fairly unique. I have to reroute one of my coolant hoses for this to work. The only other thing nearby that I am concerned with is the brake line that is routed directly under the rear frame member. I might have to just put a little heat shield below it. Other than that I removed the wheel well and there is nothing else heat sensitive or in the way of where I plan to route the exhaust.
Lol. I just thought of something funny. Why stop there? You can be like those diesel truck guys & run your exhaust out your deck lid louvers behind back window. One on each side. It will look like those stacks they put on those trucks. Maybe I shouldn't have said anything because now somebody some where with a Fiero will do it. :-)
I know you made a controlled carbon fiber wing so if you want a change it up a bit, make your own quarter panels or simply skin the ones you already have and incorporate carbon fiber all the way up to the sail panels. Similar to the R8:
I think black carbon fiber would complement the red of your car.
Had to enlist the help of a third hand while I tacked together:
United as one...
Fit is bang on... the next step will be creating the second part of the exhaust that will mate with the V-band and exit out the side scoop. I won't be able to start that until I have the cradle back in the car. In the meantime I have to reroute a coolant tube, make a few heat shields and sort some other small details out to make this work.