We're trying to get a group buy on P.I. converters going. Look for a thread in the future explaing the details of it I'm talking with them right now.
Mine is set at 6K. You should fine with 3.73s. 4.10s just don't have enough top end for me. I'm trying out DRs this Saturday. I'm hoping for low 12s (anything less than 12.5)
You might beat your friend in his Mach 1, how I don't know, because he has an easy 40 hp more than you. But I call BS on your times your running. You either have alot of weight reduction your not telling us or, you are not listing all of your mods. The mods you have listed might knock .6 - .8 tenths off. Not a full 1.5 seconds You tb/plenum might be worth 6 - 8hp combined with a decent cai. Add another 6-8 for the exhaust work. And thats it... No way your running 13.2's in a full weight car with mods listed.
Man, I wish I could trap your mph! How do u run so high with the little mods/hspwr u r making? 104, thats what stock manual machs run.