Does anyone know if i can get performance parts for my 2.5?

There is a very limited supply for these due to the fact it is a economy motor. A lot of people including myself would recommend adding 4 more cyl and 2.4 more Ltrs

Here are a few links for you

https://www.fiero.nl/forum/Forum2/HTML/023474.html
https://www.fiero.nl/forum/Forum2/HTML/044369.html
https://www.fiero.nl/forum/Forum2/HTML/049499.html

Also there is a member here with a web site that has a nice little write up of things to do.

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4.9 Caddy in Garage! Car in Driveway! ACK!

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http://home.cfl.rr.com/fierose
Central Florida Fieros
http://www.centralfloridafieros.org

There are loads of performance parts available for the Duke. Clifford Performance offers pistons, cams and I believe even headers are still availble. Trouble is that with this engine you can only do so much. There is one guy on this forum who claims to have squeezed the Duke to about 200 HP but I believe that he was plagued with some blow ups.
I guess it all comes down to how much HP you want. IMO, much above about 135 HP these engines start to operate in the "gray zone". I believe that the Duke is a fine engine for the purpose for which it was designed- a low revving economy engine. If you want the 135 HP at an affordable cost, you might try experimenting with a 30-50 HP shot of nitrous, but make sure that you don't run lean!!!!!

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87GT 3.4 Turbo Best 0-60 5.2 seconds
http://www.turbochargerpower.com/turbo.htm

Oh sure, theres TONS of performance parts for the 4 cyl Fieros, Northstars, Short stars, Small blocks, 2.8's and my favorite (though maybe Im just a little biased) twin cam V6's

quote Originally posted by 1986 Fiero 2M4: Does anyone know if i can get performance parts for my 2.5?

this is just info on the duke but its good to know before hopping the duke up
http://www.k12.nf.ca/gc/Staff/Teachers/Crummey/fiero/
there is a few things in here if you havent already seen them
http://www.secureleadercom.com/fsstore/default.asp?bodystyle=1&showcar=no&goto=frontpage.asp

Here we go Don't know why it's been archieved already, it isn't that old? Took me a WHILE to find it again.

https://www.fiero.nl/forum/Archives/Archive-000001/HTML/20040710-2-047317.html

The absolute best thing I did with my 87 (be forewarned, the head is different on these motors than the 84-86 ones) was a port/polish and gasket match on my cylinder head. The motor really woke up from 35-65mph on-ramp sprints. The 87 has nice open chambers and a different design intake manifold. I drove a friend of mine's 86 with an isuzu 5spd and my 87 with an isuzu 5spd and my 87 Duke is a far better responding 4 cylinder. Retrofitting your 86 TB to fit the 87 manifold will take some work though.