In the middle of a 3800sc swap on my 87 Fiero duke and Im wondering how you all routed your exhaust system. Dont want to cut trunk but if need to be I will need some suggestions.

If you have stock headers, no cutting necessary. You will need this muffler:
Flowtech 50363FLT - it is one 3" inlet and two 2.5" outlets. I cannot find an equal that is smaller after hours of searching. You will need additional pipe (I used one 2.5" straight, two 2.5" mandrel bent 90 degree's, and a welded 180 degree 3" pipe with a very small bend radius).
http://www.summitracing.com/parts/big-50363flt

which will look something like this (i have no pics of my own so here's another forum's):
https://www.fiero.nl/forum/Forum2/HTML/129145.html

Alternatively you can get some wicked exhaust setups with cutting the trunk, but not worth it unless you have other mods really.

[This message has been edited by AustinH (edited 01-09-2018).]

Flowmaster, Magnaflow, Spintech, and even the mighty Borla all make mufflers that will fit into this configuration without cutting the trunk.

-Van

quote Originally posted by AustinH: If you have stock headers, no cutting necessary. You will need this muffler: Flowtech 50363FLT - it is one 3" inlet and two 2.5" outlets. I cannot find an equal that is smaller after hours of searching. You will need additional pipe (I used one 2.5" straight, two 2.5" mandrel bent 90 degree's, and a welded 180 degree 3" pipe with a very small bend radius). https://www.summitracing.com/parts/big-50363flt which will look something like this (i have no pics of my own so here's another forum's): http://cliff.hostkansas.com..._exhaust_painted.jpg Alternatively you can get some wicked exhaust setups with cutting the trunk, but not worth it unless you have other mods really.

Thanks!!!

You may want to check out the thread link below and look at the image posted by JamesCurtis. I built my system to the same basic design and used a SpinTech muffler. Great product. Definitely install the flex joint to keep welds from cracking. The "U" bend in the picture was created by welding together a couple of 90* pipes. I used an exhaust donut that has an extremely tight radius. It was shaped something like an overgrown bagel and they are available in several sizes. Got mine off ebay. Don't have the muffler part number on hand, but they make a short version that fits in the small confines of a Fiero. I also installed Hedman Hot Tips as the tailpipe exits. They act like a resonator and keep the noise level down to a bearable level.
There are other write ups out there you can find if you do a search.

https://www.fiero.nl/forum/Forum2/HTML/129145.html

Second on the flex joint. Lotta movement back there with the engine and all.

Never like they way mine sounds. I have the Camaro muffler, one into two. They say its have more to do with the engine though.

BTW, if you haven't driven a 3800SC and your are going from a Duke, you are going to feel like you are in a rocket ship. Seriously.

This is how the system in my 3800 was done, no trunk cut. Spintec muffler w/ cat. Need to keep the cat here in Virginia. Good sound, no drone.




Here is the motor about to go back in. Stock exhaust that has been ceramic coated.




Rob

Thanks everyone!!

quote Originally posted by qwikgta: This is how the system in my 3800 was done, no trunk cut. Spintec muffler w/ cat. Need to keep the cat here in Virginia. Good sound, no drone. Here is the motor about to go back in. Stock exhaust that has been ceramic coated. Rob

Thanks where did you get your manifolds ceramic coated

Don't forget to wrap as much or all of the exhaust piping with high temp header wrap material good to 2000 degrees which you can get from Jegs, Summit, Oreilly, etc. I would suggest to cover as much of the piping as possible to keep down the trunk/engine bay temps. Doing this on the engine before it is installed is so much easier. I also recommend you cover the flange where the piping starts with a good turbo type cover as that flange gives off a lot of heat if not insulated. I didn't do this at first and had some of my trunk carpeting melt.

I was very pleased with this:









-Van