Hmm...I dont know i'm going to go against what everyone is saying and say go with the smaller equals, they should be fine for the 300hp number you're looking for(did you want 300rwhp or flywheel?) and I had mac longtubes and offroad hpipe installed on my near stock car and I saw no difference at the track at all although they do sound good...i'm sure it would be another story if I had more mods....
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92 AOD GT, K&N, ram air, pulleys, 2 ch. flowmasters, 4:10's, shift kit, 1 5/8 mac longtubes and offroad hpipe 14.249 @ 97.34 mph before the headers and hpipe
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