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I have a 85 F150 with 300 inline 6. I plan on putting daul exhaust with 2.25 in pipe on it and was wondering how loud a flowmaster 40 series would be and how it would sound. I have 1 of the 2 cats hollowed out.
I don't think you'll need duals on a 300 a single pipe will do fine. You might check out exhaustsoundclips.com for the sound, I think they have the 40 series on a 300 clip.
cut the cats and keep it to 1.5" duals all the way back into the largest echo cans you can find. I did that to mine, even at high RPMS it didnt sound to bad, sounded friggin awesome up to 2.5K RPMS