MX-3 has 4.388:1 final drive gear, MX-6 has 4.111:1. The MX-6 with factory tranny will transfer slightly less to the ground because of the gearing, but will have a higher top speed.
The MX-6 will weigh close to 3000lbs from the factory, but commonly weight reduction is the most popular "modification" any knowledgable driver will perform. To quote BudMan "I've got a guy here in the office running an MX6 (yes, it has the 6 cylinder) with an intake & NO INTERIOR (not even a headliner - just the dash & dr seat).....his best time is 14.3 (2 times)...normally he runs 14.5-6."
That isn't to bad for a car with only an intake now is it? 13's are achievable with an acid ported IM, 64mm TB, MX-3 flywheel shaved to 13lbs, Hotshot Headers, and just a stage 2 clutch. So for around $1000 an MX-6 that weighs 2700lbs can run mid to high 13's on a factory engine without nitrous when tuned properly. Luckily for other racers, many MX-6 owners spend their time getting the heads shaved and worry about other things like a KLZE swap.
I'm just saying this to inform you, if you go up against a knowledgable and tuned MX-6 from Probetalk.com or MX6.com your race may have very interesting results. Don't knock it till you know it, some words of caution.
(Think of a 2400Lb MX-3 with 4.388:1 final gearing and that same MX-6 motor I spoke of earlier, that's a sleeper you should be worried about
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