Quote:
Originally Posted by DeliciousTuning
We have tuned quite a few of them, so there is good and bad on these. Based on stock intake manifolds.
The good, they help the midrange quite a bit, by increasing the torque through 6K RPM.
The bad, they hurt the top end since the runners have become too long, in turn hurting power above 6500 RPM's.
For daily driving, might be nice, but for all out power and top end they do hurt it a bit.
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Yeah for non sustained high RPM use they seemed to help - they also do respond to further tuning once installed, you can recover some of the power loss at the very top with increased timing (apparently lower VE/cyl pressures in that range vs without them). Even for track use though I'd think they'd benefit in the 5000-6500 range - anyways just curious. Thanks for the reply