I have written to Borla again to get the best muffler, single inlet,dual outlet,if anyone has adapted a borla to the Fiero,with good results please let us know
If some one has one of the original Borla systems on thier car ,maybe you could look it over ,& then look over the current Borla products to get a possible match,or near match
the Dyno Max system is best for a single outlet,because it has the large mass needed ,& fits in the original muffler position, this is important for many Fiero owners that have few modifications & want more performance & better MPG
I have the truelo headers with Dyno max muffler & it is a good torque combination.
thier are fewer options as our cars get older & there are fewer of themwww.borla.com