Thread: Getting into the 12's

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that is a very good question i think a 2 1/2inch ex to 3 will not see to much hp if yours is a true mandrell bent. i would think a Xcross mandrell bent 3 1/2 would be the best and you may see some tq with the x cross and some hp. the mufflers have a lot to do with any ex so if you had a 3 with bad mufflers i think you would not see any thing maybe 20 hp on the 3 with good mufflers? but do not forget the headers . you need big headers 2 to 2 1/8 to. a big ex work the best with all the right parts matched .so i think you will be ok .try running it with ex un plug that will tell you