Originally Posted by SS_Firehawk

After 5k rpm, I'm not making as much as I did with the stock manifold. This leads me to believe that the stock manifold is better than the M370 when full bolt on's are on the vehicle. Both the intakes and headers really opened up power after 6k rpm and the M370 is the limiting factor. For a near stock vehicle, I see no issues with the M370, but for my car, I did not see a bump in midrange power and I saw a dramatic loss up top when compared to the stock manifold. I'll be removing the M370 and replacing the stock manifold soon and I'll be back on the rollers to retune the vehicle with the old manifold.

I'm not here to bash on Motordyne's products, I really like their stuff, but the M370 did not work for me. I was a M370 faithful and stood by in it's defense until I could prove whether it worked for me or not. I'm disappointed in the results, but the dyno doesn't lie. All my runs have been on the same dyno since baseline. The only differences is temperature. It was about 85 degrees last night. I'm at work and don't have the dyno run on me, I'll post when I get home. Maybe someone might be able to explain the significant power difference until then.