| Well, it certainly is still an open issue. Considering how inexpensive a drum is, if it was me I would go for the M3 based on the fact that the tech gave his opinion based on actual dyno results. Dont know if we would actually see a 5% power increase but we have spent a lot more $$$ for less gain.
I have not run my system for about 6 mos and now that I got the it going and the boost up, it does not appear to be working. I plan to do the initial track test with 110 but from that point on it will be M3.
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