[bimmerboi318]

well since its a '95 it could be soldered in or it may not be depending on the month of production. you cannot, as far as i believe, flash the ECU in a '95 since it is OBD-I. you must replace the chip. the chip wont do anything to your exhaust and your exhaust wont do anything to a chip. a chip will help whether you have a stock or aftermarket although performance aftermarket would show even more imporvement (most likely)

i say die-nin because thats how i heard it but maybe others say it differently.